Monthly Weather Bulletin May 2006

16 

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(1)

Summary:

Rainfall totals were well

above normal everywhere,

particularly in the west and

southwest, where more than

twice the normal totals for the month

were recorded. Here it was the

wettest May for at least 20 years,

while some long-term stations

measured their highest totals for a

much longer period: Birr had its

wettest May since 1916, while at

Valentia Observatory the total of just

over 200mm was its highest for May

since records began in the area in

1866. There were no exceptionally

high daily falls, but Valentia recorded

9 days during the month with daily

values of over 10mm, mainly in the

period 13th to 21st. At Malin Head

there were 13 wetdays during the

month (days with 1mm or more

rainfall), around normal for May, but

elsewhere there were between 16 and

21 wetdays generally. Mean air

temperatures were close to normal in

the south and southwest, but were

around a degree higher than normal

at some stations elsewhere. Daytime

temperatures rose above 20°C for a

short spell between the 10th and 12th,

Monthlyy Weather

Bulletin

N

No

o.. 2

24

41

1

MAY 2006

INSIDE

INSIDE

Arctic sea ice at Arctic sea ice at smallest winter extent smallest winter extent

(page 3) (page 3)

Wind &

Wind &

Elements ...

Elements ...

4

4

Marine &

Marine &

Pr

Pr

essur

essur

e ...

e ...

5

5

Agmet /La

Agmet /La

b

b

...

...

6

6

Diary ...

Diary ...

8

8

R

R

ainf

ainf

all ...

all ...

10

10

Wettest May on record Wettest May on record at Valentia Observatory at Valentia Observatory

T

T

emper

emper

a

a

tur

tur

e ...

e ...

12

12

Sunshine ...

Sunshine ...

14

14

W

W

or

or

ld

ld

W

W

ea

ea

ther

ther

..

..

15

15

T

T

he W

he W

ea

ea

ther of

ther of

Spring 2006 ...

Spring 2006 ...

16

16

Very wet Very wet generally-warmer, sunnier than warmer, sunnier than

normal normal Produced by Met Éireann,

Glasnevin Hill, Dublin 9. Annual subscription 80

For more information-tel: +353-1-8064260 fax: +353-1-8064216 climate.enquiries@met.ie

www.met.ie/climate Notes on the tables and map showing location of stations appear in each January issue

W

ETTEST

M

AY FOR MORE THAN

20

YEARS IN WEST AND SOUTHWEST

;

MILD WITH SUNSHINE TOTALS NEAR NORMAL

Over twice the normal monthly rainfall for May fell in many areas of the country, with totals of over 200mm in parts of the west and southwest; this picture was taken in Cork on the 17th, one of the wettest days of the month.

(2)

although southern coastal stations

were cooler. Although there was no air

frost recorded during the month, there

were between 4 and 11 ground frosts

observed at inland stations, higher than

the average number for May. Much of

the month was relatively dull, but some

high daily sunshine values brought

totals above normal over the northern

half of the country; the periods 10th to

11th and 29th to 31st were particularly

sunny.

1st to 8th: Bands of rain crossed the

country associated with depressions to the

west or northwest of Ireland, bringing

heaviest falls on the 2nd, 6th and 8th.

Temperatures were near or a little above

normal, while winds were generally from a

southerly direction and were strong at

times, especially on the 3rd.

9th to 12th: A ridge of high pressure over

Ireland gave mainly dry and clear

conditions with slack winds. Long sunny

spells, especially on the 10th and 11th,

brought daytime temperature values above

20°C in many places, although southern

coastal areas were cooler due to onshore

breezes. These high temperatures

generated widespread thunderstorms

during the afternoons of both the 11th

and 12th, giving heavy downpours locally

and causing some interference to power

and communication networks.

13th to 27th: A spell of very unsettled

weather, dominated by areas of low

pressure moving close to or over the

country. Rain or showers each day brought

some heavy falls in many areas, especially

2

WEATHER

May 2006

Wet spring over much of northern Europe

In common with much of northern Europe, Ireland’s rainfall totals for the spring season (March to May) were well

above normal, due mainly to very wet weather during May. Some heavy falls over the Iberian peninsula during the

season helped to relieve drought conditions there, but long-term drought persisted in other parts of the

Mediterranean, as well as in sub-Saharan Africa, in the southeastern United States and in eastern and southern

Australia- see spring weather summary for Ireland on page 16.

map courtesy NOAA, US Department of Commerce

-100 -80 -60 -40 -20 0 +20 +40 +60 +80 +100

(3)

in the southwest and west, where river

flooding became extensive; heaviest falls

were on the 14th, 17th and 21st. A

tornado developed in Buncrana, Co.

Donegal, on the 16th, a day of extensive

shower activity. Dull overall and becoming

cool late in the period. Gale or strong gale

gusts were widely recorded on the 17th

and 18th, when an unusually deep

depression for May passed close to the

northwest coast (see below).

28th to 31st: A large Atlantic anticyclone

moved eastwards towards Ireland, bringing

mainly dry and clear conditions in a west

to northwesterly airstream, later veering

northerly. Daytime temperatures were

close to normal but nights were cool under

clear skies, with ground frost at inland

stations.

Wind and elements: Mean windspeeds

for the month of between 7 and 12 knots

generally (13 and 22 km/hour)were close

to normal for May. The strongest winds of

the month were measured on the 3rd and

in the period 17th/18th, with the highest

gust of 54 knots (100 km/hour) recorded

at Belmullet on the 3rd. Thunder was

frequentduring the month; it was recorded

on the 3rd-4th, 7th, 10th-13th, 14th-18th

and 23rd. Hail showers were observed on

the 2nd and between the 22nd and 24th.

Most fog was recorded in the periods 9th

to 10th and 25th to 27th.

3

WEATHER

Synoptic chart at 0000UTC on 18th May 2006

Arctic sea ice at smallest

winter extent

A larger area of the Arctic ocean was left unfrozen during the recent

winter than in any previous year. Satellite measurements show that

the area covered by Arctic sea ice during March, when it is normally

at its greatest extent of the year, was the lowest on record, reduced

by 300,000 square kilometres compared with 2005. A long-term

slow decline of ice around the North Pole seems to have

accelerated sharply since 2003, raising fears that the region is

locked into a cycle of irreversible change. If the present rate of ice

reduction continues, the Arctic ocean could become ice-free in

summer much earlier than previously suggested, possibly by 2030.

If this happens, it would be the first time in almost a million years

that the Arctic has not been covered by ice throughout the year.

The decrease in seasonal ice cover, together with rising air and

seawater temperatures, is having a significant impact on marine

ecosystems. Canadian and U.S. researchers of the National

Science Foundation have found a series of biological changes in

the northern Bering Sea that could have long-range and irreversible

effects on the animals that live there and on the people who

depend on them for their livelihoods. Large populations of seabirds,

fish and other marine animals, all of whom depend on small

bottom-dwelling creatures for sustenance, are in decline as they

are replaced by a smaller range of animals adapted to warmer

(4)

4

WIND & ELEMENTS

F

REQUENCY OF WIND DIRECTION

CO. CLARE

SHANNON AIRPORT 10.0 120° 27 17/13 200° 41 17/1800 0 9 30 0 0 1 2 4

330° 27 22/10 330° 41 22/0837

CO. CORK

CORK AIRPORT 10.1 210° 31 18/11 210° 49 18/1008 0 8 39 0 0 0 1 10

CO. DONEGAL

MALIN HEAD 16.3 190° 36 3/09 180° 52 3/0740 3 18 144 0 0 2 0 0

CO. DUBLIN

CASEMENT AERODROME 9.6 200° 31 18/13 200° 45 18/1234 0 8 33 0 0 0 2 2

DUBLIN AIRPORT 10.8 260° 28 26/14 190° 40 3/0906 0 8 26 0 0 0 2 4

260° 28 27/15

CO. KERRY

VALENTIA OBSERVATORY 9.7 210° 30 17/18 210° 44 17/1705 0 7 40 0 0 1 0 1

CO. KILKENNY

KILKENNY 7.9 190° 25 2/12 190° 37 2/0931 0 4 11 n/a 0 n/a

---210° 25 17/18 ---210° 37 17/1708

CO. MAYO

BELMULLET 11.7 200° 36 17/20 190° 54 3/0348 1 13 85 0 0 4 3 2

KNOCK AIRPORT 10.0 200° 28 17/21 200° 46 17/2053 0 7 28 0 0 1 1 6

CO. MONAGHAN

CLONES 8.0 190° 24 17/21 190° 39 17/2027 0 5 9 n/a 0 n/a

---CO. OFFALY

BIRR 7.5 190° 24 18/12 190° 42 2/1223 0 4 7 n/a 0 n/a

---CO. WESTMEATH

MULLINGAR II 7.1 170° 21 2/11 170° 33 2/1031 0 0 0 n/a 0 n/a

---180° 21 18/12

CO. WEXFORD

ROSSLARE 10.1 200° 28 18/12 200° 47 18/1410 0 10 69 0 0 0 0 4

W

IND

((

KNOTS

))

E

LE

EME

ENTS

County /

Station

Valentia Observatory

Dublin Airport

N

NE

NW

NW

SW

SW

W

W

SE

SE

NE

N

E

S

E

S

Calm: 0.3%

Calm: 0.1%

0 1 2 3 4%

May 2006

Mean Max. 10-min. mean Max. Gust Days with Hours with

speed dir. speed date/hour dir. speed date/time gales gale gusts gale gusts Snow Snow Lying Hail Thunder Fog

2% 4%

6% 8%

2% 4%

(5)

5

MARINE & PRESSURE

HHoouurrllyy w

wiinndd aanndd w

waavvee ccoonnddiittiioonnss aatt M

M11 ((5533°°0077’’NN,, 1111°°1122’’W

W))

Wind Direction

Wind Speed

Sea Temperature

Wave Height

dd

ee

gg

rree

ee

ss

ffrr

oo

mm

nn

oo

rrtt

hh

kknn

oo

ttss

°°CC

360 300

200

100

0

15

14

13

12

11

10 40

30

20

10

0

1 5 10 15 DATE 20 25 31

M

E

EA

AN

N

A

T

TM

MO

OS

SP

PH

HE

ER

RIIC

C

P

R

RE

ES

SS

SU

UR

RE

E

Mean sea level pressure values for the month ranged

from around 1010hPa in the northwest to 1012hPa

in the southeast, around 4hPa below normal values

for May. Pressure was near or below normal for

much of the month, but rose well above normal

during the final week. The lowest pressure of the

month, 981.3hPa at Cork Airport, was associated

with a deep depression to the southwest of Ireland

on the 21st. The highest value, 1031.4hPa, was

recorded at Valentia Observatory on the 31st.

M

Meeaann ddaaiillyy M

Meeaann SSeeaa LLeevveell pprreessssuurree

(hPa)

mm

ee

ttrr

ee

ss

12

10

8

6

4

2

0

980 990 1000 1010 1020 1030 1040

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31

40˚N 50˚N 60˚N

H

1022

H

1018

L

1008

101 6

1

1016

1016

--

-- Valentia Observatory —

— Malin Head May 2006

M

ARINE

O

BSERVATIONS FROM

I

RISH

M

ARINE

D

ATA

B

UOY

N

ETWORK

Monthly mean MSL pressure, based on 1200 UTC values

SSuum

mm

maarryy ooff M

Meeaann M

Moonntthhllyy VVaalluueess

Sea Mean Max. Mean Max.

Buoy surface wind 10-min wave wave temp. speed wind height height

(°C) (knots) (knots) (m.) (m.)

M1

11.2 12.3 32 2.5 5.5

M2 9.4 13.2 30 1.1 3.2

M3 11.5 13.3 32 2.5 6.3

M4 not available

M5 11.3 14.8 31 1.4 4.1

Malin 10.7 (+0.7°C above normal)

Head



M1



M5

z

Malin Head

M4





M2

(6)

6

AGMET / LABORATORY

CO. CLARE

SHANNON AIRPORT 11.5 11.6 12.3 CARRON 12.0 12.4

CO. CORK

FERMOY (MOORE PARK) 12.8 12.7 13.0 CORK AIRPORT 10.9 11.1 11.8 SHERKIN ISLAND 12.9 13.4 BALLINCURRIG (PEAFIELD) 11.3 11.0 11.8

CO. DONEGAL

MALIN HEAD 11.3 11.3 11.5

CO. DUBLIN

DUBLIN AIRPORT 10.8 11.0 11.4 CASEMENT AERODROME 11.1 11.2 12.1

CO. KERRY

VALENTIA OBSERVATORY 12.1 12.4 13.4

CO. KILKENNY

KILKENNY 12.1 12.3 13.1

CO. LIMERICK

MOUNT RUSSELL 10.4 11.2

CO. LOUTH

ARDEE (BOHARNAMOE) 10.6 11.3 11.4

CO. MAYO

BELMULLET 12.2 13.0 13.8 STRAIDE 11.3 KNOCK AIRPORT 9.6 10.2 11.0

CO. MEATH

WARRENSTOWN 10.8 11.6 12.6

CO. MONAGHAN

CLONES 11.2 11.5 11.8

CO. OFFALY

BIRR 11.7 12.1 12.8

CO. TIPPERARY

FETHARD (PARSONSHILL) 10.6 11.6

CO. WATERFORD

DUNGARVAN (CARRIGLEA) 12.5 12.8

CO. WESTMEATH

MULLINGAR II 11.9 12.2 12.7

CO. WEXFORD

JOHNSTOWN CASTLE 12.3 11.9 12.3 ROSSLARE 12.4 12.2 13.2 JOHN F. KENNEDY PARK 12.1 12.0 13.2 CLONROCHE (KNOXTOWN) 11.5 11.7 12.0

100mm 200mm 300mm

County/ Station

Soil Temperatures at 0900UTC

Mean 100mm

Soil Temperatures (°C)

at 0900UTC

(difference from 1961-90 normals in brackets)

°C

Soil Moisture Deficits (mm)

10th of month / end of month

(0 represents field capacity, -10 saturation)

11.3

(+0.6)

9.6

11.2

(+0.8)

11.5

(-0.3)

12.1

(+0.7)

12.1

(+0.9)

12.4

(+0.6)

11.7

(+0.6)

10.9

(+0.4)

11.9

(+1.6)

11.1

(+0.4)

19/17

4/17

6/14

5/12

27/9

31/12

26/14

7/11

30/16

4/10

7/10

40/22

12.2

(+1.0)

NO2-N

  

SO2-S

„ „ „

SO4-S

z z z

(μgs/m3)

electrical conductivity

(

μ

S/cm)

Chemical Analysis of Precipitation and Air Samples

at Valentia Observatory

0 0.5 1 1.5 2 2.5 3

1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31

0 50 100 150 200 250 3 4 5 6 7 8 PRECIPITATION AIR

Acid rain occurs when pollutants combine with moisture in the air to form sulphuric or nitric acid. pH is the simplest way of measuring the acidity of precipitation. Usually pH of 7.00 is considered neutral but this is not the case in rainfall samples. Pure water in the atmosphere has an equilibrium pH value of 5.65 at 20°C owing to carbon dioxide in the air dissolving to form carbonic acid. Any value below pH 5.65 is considered acid while any value above is considered alkaline.

Sulphur dioxide and sulphate in air contribute to the formation of sulphuric acid; nitrate in air contributes to the formation of nitric acid.

Conductivity measures the total ion activity in the rainfall, i.e. the higher the conductivity the greater the number of ions present.

pH

May 2006

pH and electrical conductivity are not available on dry days (<0.2mm)

(7)

7

AGMET

May 2006

Co. Cavan 1-10 43.3 - 6 6 14.8 6.7 10.8 - 5.1 5 0 63 18 1.8 8 0 - - 49.3 -

Cavan (Loreto) 11-20 61.6 - 9 7 16.5 9.1 12.8 - 5.2 13 0 84 31 3.5 11 0 - - 43.9 - 21-end 22.6 - 7 3 15.1 5.6 10.4 - 1.2 23 0 67 21 -1.0 23 1 - - 71.8 -

month 127.5 22 16 15.4 7.1 11.3 1.2 23 0 214 69 1.0 23 1 165.0

-Co. Cork 1-10 36.3 - 8 7 14.7 6.4 10.6 - 4.3 5 0 61 15 -2.5 5 5 11.4 11.7 49.2 -

Fermoy 11-20 66.9 - 9 9 16.5 9.4 13.0 - 5.2 11 0 85 32 -0.7 20 1 13.9 14.0 28.5 - 21-end 23.9 - 6 5 15.3 6.5 10.9 - 0.2 23 0 73 23 -4.5 23 3 12.9 13.4 56.1 -

month 127.1 187 23 21 15.5 7.4 11.5 1.0 0.2 23 0 220 71 -4.5 23 9 12.8 13.0 133.8 77

Co. Donegal 1-10 33.5 - 7 6 15.8 6.9 11.4 - 4.1 10 0 69 23 3.2 10 0 - - - -

Glenties 11-20 56.0 - 8 7 15.7 8.1 11.9 - 1.1 13 0 76 25 0.2 13 0 - - - - 21-end 16.6 - 8 7 13.8 5.1 9.5 - 0.1 24 0 59 15 0.1 25 0 - - - -

month 106.1 115 23 20 15.1 6.6 10.9 0.9 0.1 24 0 205 63 0.1 25 0

-Co. Kerry 1-10 38.1 - 8 6 15.6 6.8 11.2 - 5.0 8 0 68 21 -0.8 5 2 - - 59.6 -

Ardfert 11-20 47.6 - 9 9 16.6 9.9 13.3 - 6.8 20 0 89 34 1.9 11 0 - - 42.0 - 21end 40.2 7 5 14.8 6.4 10.6 2.3 30 0 69 20 1.8 30 1 58.2

month 125.9 24 20 15.6 7.7 11.7 1.1 2.3 30 0 225 75 1.8 30 3 159.8

-Co. Louth 110 34.4 9 7 15.4 7.1 11.3 4.3 5 0 69 21 4.4 5 0 9.9 10.5

-Ardee 11-20 83.7 - 8 8 16.4 8.4 12.4 - 6.2 13 0 80 29 6.0 16 0 11.6 12.4 - - 21-end 27.3 - 5 4 14.5 5.9 10.2 - 1.1 23 0 65 19 0.2 23 0 10.3 11.3 - -

month 145.4 242 22 19 15.4 7.1 11.3 1.2 1.1 23 0 214 68 0.2 23 0 10.6 11.4

-Co. Waterford 1-10 27.2 - 7 5 14.8 7.0 10.9 - 3.9 5 0 65 17 2.5 5 0 - 11.7 57.1 -

Dungarvan 11-20 71.4 - 9 9 16.4 9.8 13.1 - 5.6 11 0 87 33 5.0 11 0 - 13.8 40.2 - 21end 35.5 6 5 15.7 6.9 11.3 0.5 23 0 77 26 0.4 23 1 13.0 61.4

-month 134.1 - 22 19 15.6 7.8 11.7 0.9 0.5 23 0 229 76 -0.4 23 1 - 12.8 158.7 87

Co. Wexford 1-10 37.6 - 6 5 14.0 7.5 10.8 - 5.3 1 0 63 15 0.9 1 0 11.3 11.3 50.5 -

Johnstown Castle 11-20 67.7 - 9 9 16.0 9.6 12.8 - 7.1 20 0 84 30 5.4 12 0 13.4 13.3 30.8 - 21-end 34.7 - 8 4 16.0 7.3 11.7 - 3.8 23 0 80 26 -0.1 31 1 12.1 12.4 57.0 -

month 140.0 219 23 18 15.4 8.1 11.8 1.5 3.8 23 0 227 71 -0.1 31 1 12.3 12.3 138.3 -

amount % of average rain days wet days mean max. mean min. mean daily diff. from average lowest min. date days with air frost degree days > 4.4°C degree days > 10.0°C lowest "grass-min." date days with ground frost mean 10cm at 0900h mean 30cm at 0900h total no. of hours % of average

S

Stta

attiio

on

n

period

R

AINFALL

T

EMPERATURE

S

UNSHINE

10-

DAY VALUES FOR SELECTED

A

GROMETEOROLOGICAL

S

TATIONS

M

M

EEAASSUURREEDD

P

P

OOTTEENNTTIIAALL

E

E

VVAAPPOOTTRRAANNSSPPIIRRAATTIIOONN

((P

P..E

E..))

A

ANNDD

S

S

OOIILL

M

M

OOIISSTTUURREE

County/ P.E. (mm) Soil Moisture (mm)

Station Period Amount Deficit Accum’ltd Deficit Surplus

M

M

OONNTTHHLLYY

E

E

VVAAPPOORRAATTIIOONN

((

MMMM

))

FFRROOMM

C

C

LLAASSSS

A

A P

P

AANN County Station Monthly Monthly

Rainfall (mm) Evaporation (mm)

Clare Kilmaley 176.2 81.7

Cork Fermoy (Moorepark) 127.1 68.0

Kerry Valentia Observatory 201.0 67.0

Kildare Poulaphuca 84.5 60.1

Mayo Newport (Furnace) 135.6 76.3

Offaly Derrygreenagh 151.0 60.1

Waterford Dungarvan (Carriglea) 134.1 65.3

Wexford Johnstown Castle 140.0 81.4

P

P..E

E..

(Penman)

County/ total for Station month(mm)

G

G

LLOOBBAALL

S

S

OOLLAARR

R

R

AADDIIAATTIIOONN

(MJ/sq. m.)

10-day totals Total for 1-10 11-20 21-end month

Co. Kerry

1-10 Valentia Obs. 11-20

21-end

month Co. Wexford

1-10 Johnstown Castle 11-20 21-end

month

30.1 - 0 44 26.7 - 0 52 16.0 - 0 47

72.8

14.1 - 9 27 30.1 - 0 30 30.4 - 0 12

74.6

Co.Clare

Shannon Airport

Co.Cork

Cork Airport

Co.Donegal

Malin Head

Co.Dublin

Dublin Airport Casement Aerodrome

Co Kerry

Valentia Obs.

Co.Kilkenny

Kilkenny

Co.Mayo

Belmullet Knock Airport

Co.Monaghan

Clones

Co.Offaly

Birr

Co.Westmeath

Mullingar

Co.Wexford

Rosslare

79 69 99 83 87 74 70 82 77 77 68 71 79

179.53 153.69 236.13 569.35 142.94 133.03 197.62 473.59

168.14 130.85 185.01 484.00 137.85 132.15 190.15 460.15 173.89 142.89 232.69 549.47

135.44 128.74 191.08 455.26 144.46 135.12 177.14 456.72

(8)

Monday 1st:A weak ridge of high pressure over the country. A few showers overnight, mainly along northwestern coasts. The day was mainly dry with sunny spells and scattered showers. Afternoon temperatures were slightly below normal in places. Showers became confined to western areas after dark. Light to moderate northwesterly winds were fresh and gusty at times, particularly in the north; winds backed southwesterly by afternoon and eased. Rainfall: trace generally to 2mm near west and southwest coasts

Temperature: max. 11°C to 14°C, min. 4°C to 7°C, no ground frost Sunshine: 6 to 10 hours, sunniest in north

Tuesday 2nd:A depression to the northwest moved slowly northeastwards during the period. Its associated frontal trough moved eastwards across the country, clearing the east coast by early evening. Rain in most areas at first, light in eastern areas, cleared to showers in western areas by afternoon. Some sunny periods, mainly in the extreme north and southwest. Cool. Fresh to strong south to southwesterly winds, up to gale force at times.

Rainfall: 2 to 6mm in east and south,10 to 24mm elsewhere, heaviest in southwest Temperature: max. 11°C to 13°C, min. 5°C to 8°C, no ground frost

Sunshine: 1 to 4 hours, sunniest at Belmullet

Wednesday 3rd:A south to southwesterly airflow covered Ireland. A frontal trough crossed the country during the day. Showers and patchy rain along west and southwest coasts overnight moved eastwards during the morning, but rainfall amounts were generally small. Showery rain continued during the afternoon, but it was mainly dry and sunny. The evening was dry apart from scattered showers in the west. Some mist also in places.

Rainfall: trace to 7mm, heaviest in southwest

Temperature: max. 12°C to 17°C, min. 6°C to 9°C, no ground frost Sunshine: trace to 10 hours, dullest in south, sunniest at Malin and Belmullet

Thursday 4th:A southerly airflow covered Ireland. Frontal troughs over the east of Ireland moved northeastwards during the evening. Cloudy and wet in the east and northeast with some heavy thundery rain. Clear spells and scattered showers elsewhere; more persistent showers spreading in from the Atlantic later. Winds from a south to southeastly direction were moderate to fresh, decreasing light to moderate overnight.

Rainfall: 1 to 13mm, lightest in south, heaviest in north midlands Temperature: max. 11°C to 17°C, min.3°C to 9°C, no ground frost Sunshine: <1 hour generally, 7 hours at Shannon and Belmullet

Friday 5th:A southerly airflow over Ireland. A showery trough over the country moved northeastwards. Showers in the west overnight, but mainly dry elsewhere with some mist in places. Showers became more widespread during the afternoon before becoming confined to the west coast once more by evening, where some were heavy.

Rainfall: <1mm in north and east, up to 12mm at Valentia

Temperature: max. 13°C to 17°C, min. 3°C to 8°C, ground temperatures down to -2°C at Kilkenny and Birr

Sunshine: 5 to 12 hours, sunniest at Rosslare

Saturday 6th:An unstable southerly airflow covered the country. A cold front moved northeastwards along the west coast. Rain in the west overnight, heavy in places, otherwise dry with some clear spells.. The rain continued through the morning in western areas, with scattered showers developing over the rest of the country, but with dry and sunny periods also. In the afternoon showers became more widespread with strong and gusty southerly winds. Showers died out during the evening apart from near the west coast.

Rainfall: dry in north, 4 to 12mm generally, 20mm at Belmullet Temperature: max. 11°C to 17°C, min. 6°C to 9°C, no ground frost Sunshine: 3 to 12 hours, sunniest in north

Sunday 7th:A depression of 1003hPa moved close to the west coast. A clear, cold night in eastern areas, but heavy thundery rain in the southwest moved along the west coast during the night. Showers continued near southwestern and western coasts during the day, but elsewhere it was dry with long spells of sunshine. Becoming warm in any sunshine but where showers occurred it remained quite cool. A strong southerly airflow over Ireland at first moderated and backed southeasterly.

Rainfall: nil or trace generally, 7mm at Valentia

Temperature: max. 13°C to 17°C, min. 5°C to 9°C, ground temperature below zero at Casement Aerodrome

Sunshine: 7 to 13 hours, sunniest in east

Monday 8th:A depression of 1009hPa to the east gradually filled and drifted northwards; its associated frontal system remained slow-moving over Ireland. Heavy thundery rain in the southeast at first spread slowly northwards, giving heaviest falls along Irish Sea coasts. Dull throughout, except in the extreme north. Winds were mainly light or calm, but stronger in the north.

Rainfall: nil in north, 4 to 9mm generally, 19mm in southeast Temperature: max. 12°C to 16°C, min. 6°C to 10°C, no groud frost Sunshine: <1 hour generally, 7 hours at Malin Head

Tuesday 9th:Mist or fog during the night, dense in places and with some drizzle also. After a cold start, sunny spells developed during the day, although hazy in some areas. Daytime temperatures near normal, although cooler in the southeast. Fog and mist again during the evening, mainly in southeastern areas. Light variable winds throughout.

Rainfall: <0.2mm everywhere

Temperature: max. 14°C to 18°C, min. 4°C to 10°C, ground temperatures below zero at Birr

Sunshine: 2 hours at Rosslare, 4 to 11 hours generally, sunniest at Malin Head

Wednesday 10th:An anticyclone over Greenland maintained a ridge of high pressure over Ireland. Misty with fog patches overnight. Apart from a few thundery showers in the northwest, it was a dry, warm and sunny day generally. Mist returned in places in the evening. Winds generally were light and variable. Rainfall: nil or trace

Temperature: max. 12°C in southeast to 21°C at Shannon, min. 5°C to 10°C, no ground frost

Sunshine: 4 hours at Rosslare, 10 to 14 hours generally

Thursday 11th:A ridge of high pressure over the country. Dry overnight with mist and fog in places and light winds. Mainly dry with hazy sunshine, but isolated thundery showers developed during the afternoon and evening, with some heavy downpours in the west. Warm inland. Light easterly winds. Rainfall: nil or trace generally, 25mm at Claremorris

Temperature: max.15°C to 23°C, min. 7°C to 11°C, no ground frost Sunshine: 5 to 13 hours, sunniest in south

Friday 12th:Dry overnight with fog in places, persisting near the south coast until late morning. Showers developed by noon and became heavy and thundery in the midlands and east before dying out later. Warm inland, but cooler near coasts. Dull near the south coast, but sunny spells elsewhere before the showers developed. Winds were light and variable in direction, becoming moderate northeasterly in the north and west.

Rainfall: <2mm generally, 8mm at Birr, 17mm at Dublin Airport Temperature: max. 12°C to 20°C, min. 6°C to 10°C, no ground frost Sunshine: nil at Valentia, 2 to 10 hours generally, highest in north

Saturday 13thLight rain or drizzle in the southern half of the country overnight, but dry elsewhere. During the afternoon, heavy thundery showers broke out in the south and continued for several hours. Mainly dry and sunny elsewhere, but cooler than recent days. Winds were light throughout, northerly at first, becoming east to southeasterly.

Rainfall: 10 to 23mm over southern counties, <6mm elsewhere Temperature: max.11°C to 16°C, min. 5°C to 11°C, no ground frost Sunshine: nil at Birr and Rosslare, 4 to 11 hours generally, highest in north

Sunday 14th:Heavy rain in the midlands moved eastwards at first, with further heavy rain moving into the southwest by dawn. This band of rain moved very slowly northeastwards through the day, but it remained cloudy throughout. Winds were light southeasterly.

Rainfall: 4 to 10mm generally, 14 to 26mm in midlands and west Temperature: max. 13°C to 17°C, min. 8°C to 12°C, no ground frost Sunshine: <1 hour everywhere

Monday 15th:A depression of 998hPa to the west of Ireland moved slowly northwards. The associated occlusion moved northeastwards across Ireland during the day, giving a spell of rain in all areas, heaviest in the south and southwest. A clearance to sunny spells and showers, some thundery, spread across the country during the afternoon. Moderate southerly winds, stronger near Atlantic coasts.

Rainfall: 1 to 16mm, heaviest at Valentia

Temperature: max. 14°C to 18°C, min. 9°C to 12°C, no ground frost Sunshine: nil to 4 hours

(9)

Tuesday 16th:An unstable south to southwesterly airflow covered Ireland, as a depression lay off the northwest coast. Dry overnight with clear spells and light winds. Showers developed early in western areas and became more widespread during the afternnon, but with sunny spells also. Showers died out during the evening, with mist developing in places.

Rainfall: nil to 1mm generally, 7mm at Clones, 17mm at Belmullet Temperature: max. 14°C to 18°C, min. 8°C to 12°C, no ground frost Sunshine: 1 to 3 hours generally, 6 to 8 hours in east

Wednesday 17th: A deepening depression to the southwest moved northeastwards across the country. After a dry start, wet and windy weather moved into the southwest and moved steadily northeastwards during the day; the rain was heavy and persistent at times. A short clearance followed in the afternoon but more showery rain moved in during the evening. Light southeasterly winds overnight increased fresh to strong and very gusty later. Rainfall: 2 to 23mm, lightest in east, heaviest in south

Temperature: max. 13°C to 16°C, min. 8°C to 12°C, no ground frost Sunshine: nil to 2 hours

Thursday 18th:Some heavy rain or showers in the north at first, otherwise mainly dry with scattered light showers. During the morning, heavy thundery showers developed in the west, spreading countrywide by early afternoon; the showers gradually died out through the evening. Winds were southwesterly at first, strong near coasts, gradually decreasing by late afternoon.

Rainfall: 1 to 11mm, heaviest at Shannon Airport

Temperature: max. 13°C to 16°C, min 9°C to 11°C, no ground frost Sunshine: 1 to 6 hours generally, 10 hours at Casement Aerodrome

Friday 19th:Showers in many areas overnight cleared temporarily before a band of rain moved slowly northwards over the country during the afternoon, turning heavy by evening. Some sunny spells early in the day, but mainly cloudy. Strong westerly winds backed southwesterly, strongest along southern coasts. Rainfall: 2 to 10mm generally, 22mm at Knock Airport

Temperature: max. 12°C to 16°C, min. 8°C to 11°C, no ground frost Sunshine: 2 to 5 hours

Saturday 20th: Areas of low pressure circulated close to the country.

Persistent rain over northern areas at first died out by morning. The day was mostly dry apart from isolated light showers, but frontal rain moved into the southwest during the late evening. Sunny spells in all areas, especially in the west. Light cyclonic winds.

Rainfall: nil to 5mm generally, 8mm at Clones

Temperature: max. 11°C to 16°C, min. 4°C to 9°C, slight ground frost at Clones Sunshine: 3 to 10 hours, sunniest at Belmullet

Sunday 21st:A band of rain made slow progress northwards during the day, not reaching the extreme north by nightfall. This rain was heavy in many areas, especially over the south, where it later cleared to showers. Little sunshine generally except in the north. Winds were light and variable throughout. Rainfall: <1mm at Malin and Belmullet, 11 to 30mm elsewhere, heaviest in south Temperature: max. 7°C to 15°C, min. 3°C to 10°C, ground temperatures down to -2°C at Clones

Sunshine: nil to 3 hours generally, 7 hours at Malin Head

Monday 22nd:A deep area of low pressure to the south of the country moved gradually eastwards during the period, leaving Ireland in a cool northerly airflow. Rain and strong winds during the night, mainly in eastern areas, with showers elsewhere. Showers became less frequent during the afternoon before dying out by late evening. Cool with ground frost developing after dark. Strong and gusty northerly winds eased later.

Rainfall: nil to 3mm

Temperature: max. 9°C to 13°C, min. 2°C to 6°C, ground temperatures down to -3°C at Birr

Sunshine: 2 hours at Rosslare, 5 to 9 hours generally, 11 hours at Belmullet

Tuesday 23rd:A westerly airflow covered Ireland. Slight to sharp ground frost in many inland areas during the night. Mainly dry at first but showers quickly developed, some heavy and thundery. Long sunny spells in most areas also, but temperatures were well below normal. West to southwesterly winds, up to gale force during the day, falling light by evening.

Rainfall: nil at Rosslare, 2 to 9mm elsewhere

Temperature: max. 11°C to 13°C, min. 1°C to 6°C, ground temperatures

down to -4°C at Kilkenny Sunshine: 5 to 9 hours

Wednesday 24th:Low pressured centred to the north of Ireland. Showers in many areas overnight became isolated by morning. A band of frontal rain crossed over Munster and south Leinster during the afternoon, but rainfall amounts were generally small. Long sunny spells in the north but dull in south. Moderate westerly winds with gale gusts on northern and northwestern coasts. Rainfall: 1 to 7mm, heaviest at Valentia

Temperature: max. 10°C to 14°C, min. 2°C to 8°C, ground temperatures down to -1°C at Birr

Sunshine: nil to 3 hours in south, 10 to 13 hours over northern half

Thursday 25th:A weak ridge of high pressure over Ireland declined and moved slowly eastwards. A warm front moved northwards over the country during the afternoon. Cold overnight with a slight ground frost inland. After a mostly dry start, rain moved northwards across the country during the evening. Afternoon temperatures remained below normal for the time of year. Light variable or northwesterly winds.

Rainfall: 1 to 4mm generally, 10mm at Shannon Airport

Temperature: max. 12°C to 16°C, min. 2°C to 9°C, ground temperatures down to -2°C at Birr

Sunshine: 3 to 9 hours generally, nil at Valentia

Friday 26th:A humid west to southwest airflow over the country as a frontal rainbelt crossed the country. Widespread rain and drizzle at first cleared during the morning, with some sunny spells developing. The afternoon and evening were mainly dry apart from isolated showers. Mist developing in places later with light winds.

Rainfall: dry in south, 3 to 9mm elsewhere

Temperature: max. 13°C to 19°C, min. 9°C to 12°C, no ground frost Sunshine: <1 hour in southwest, 2 to 7 hours generally

Saturday 27th:A cold front over Ireland as a westerly airflow became established over the country. Rain overnight and during the morning cleared southwards around noon. Strong and gusty westerly winds throughout. Rainfall: 1 to 6mm generally, 13mm at Valentia

Temperature: max. 15°C to 18°C, min. 8°C to 10°C, no ground frost Sunshine: 2 to 8 hours, sunniest in north

Sunday 28th:A showery trough approached the country from the north. A mainly dry day with isolated showers. Cloud amounts varied, with long sunny spells in the north, but daytime temperatures below normal. Light to moderate southwest to westerly winds increased in strength and veered northwesterly. Rainfall: <1mm everywhere

Temperature: max. 12°C to 15°C, min. 6°C to 9°C, no ground frost Sunshine: trace to 4 hours generally, 9 hours at Malin Head

Monday 29th:A northerly airflow over the country. Cold overnight with a few showers in western and northern areas. Isolated showers during the day, but generally it was a dry, cool day with long sunny spells. North to northwesterly winds were up to gale force at times, falling light by evening. Rainfall: <2mm everywhere

Temperature: max.11°C to 16°C, min. 4°C to 8°C, slight ground frost at Kilkenny Sunshine: 9 to 13 hours, sunniest in east and south

Tuesday 30th:An anticyclone to the west continued to build. Cold overnight with slight ground frost. Another dry, cool and sunny day with very isolated showers. Northwesterly winds strengthened during the day before falling light again during the evening.

Rainfall: nil or trace

Temperature: max. 13°C to 16°C, min. 2°C to 8°C, ground temperatures down to -3°C at Kilkenny

Sunshine: 8 to 15 hours, sunniest at Cork Airport

Wednesday 31st:An anticyclone was centred to the southwest. Cold and dry overnight with frost in some inland areas. Cloudy with occasional light rain in the extreme north, but otherwise dry and sunny and becoming a little warmer than recent days. Winds were light and variable in direction.

Rainfall: nil or trace

Temperature: max. 13°C to 18°C, min. 2°C to 7°C, ground temperatures down to -3°C at Kilkenny and Birr

Sunshine: 8 to 15 hours generally, 2 hours at Malin Head

9

DIARY

(10)

Rainfall totals for the month

were above normal everywhere

and it was a particularly wet

month near western,

southwestern and eastern coasts.

Totals ranged from 73mm at

Malin Head to 269mm at Maam

Valley, Co. Galway, with

percentage of normal values

between 115% of normal at

Glenties, Co. Donegal and 242%

at Ardee (Boharnamoe), Co.

Louth. It was the wettest May

generally for at least 20 years,

while some stations measured

their highest totals for a much

longer period: Birr had its

wettest May since 1916, while at

Valentia Observatory the total of

201mm was its highest for May

since records began in the area

in 1866.

As seen from the chart of daily

values opposite, the wettest periods

of the month were during the first

week and between the 12th and

27th. The period between the 17th

and 21st was particularly wet. Maam

Valley measured the highest daily

fall of the month, 37.7mm on the

21st; the daily value of 37.1mm on

the same day at Mountrussell, Co.

Limerick, was the highest daily fall

for May at the station since it

opened in 1984. There were

between 16 and 22 wetdays (days

with 1mm or more of rainfall) during

the month in most places compared

with the normal range for May of

13 to 16 wetdays.

10

RAINFALL

CO. CAVAN

CAVAN (LORETO COLLEGE) 126.9 17.0 14 22 16

CO. CLARE

SHANNON AIRPORT 125.8 210 15.8 25 23 20 CARRON 185.6 206 22.1 25 25 22

CO. CORK

FERMOY (MOORE PARK) 127.1 187 16.3 17 23 21 CORK AIRPORT 134.5 160 27.6 13 23 22 SHERKIN ISLAND 143.2 199 28.5 20 22 19 BALLINCURRIG (PEAFIELD) 156.0 28.5 21 24 20

CO. DONEGAL

MALIN HEAD 73.4 124 11.4 17 19 13 BALLYSHANNON(CATHLEEN'S FALL) 97.5 143 11.0 17 23 15 GLENTIES 105.0 115 24.7 17 23 20

CO. DUBLIN

DUBLIN (PHOENIX PARK) 105.8 186 20.8 12 18 15 DUBLIN AIRPORT 125.8 15.8

CASEMENT AERODROME 75.4 130 16.8 21 20 15 DUBLIN (MERRION SQUARE) 86.3 160 18.3 21 19 14

CO. GALWAY

GALWAY (UNIV.COLL.) 136.4 182 22.7 21 22 18 MAAM VALLEY 268.9 37.7 21 25 23 CONNEMARA NATIONAL PARK 177.5 183 26.1 1 21 19 BALLYGAR 119.6 171 n/a n/a n/a

CO. KERRY

VALENTIA OBSERVATORY 201.0 226 22.5 13 23 20 ARDFERT (LISCAHANE) 125.9 17.5 21 24 20

CO. KILKENNY

KILKENNY 98.2 158 15.9 21 25 23

CO. LIMERICK

MOUNT RUSSELL 164.2 37.1 21 24 23

CO. LOUTH

ARDEE (BOHARNAMOE) 145.4 242 20.5 19 22 19

CO. MAYO

BELMULLET 123.2 181 16.1 16 21 15 STRAIDE 138.5 185 21.6 19 22 17 KNOCK AIRPORT 139.2 24.1 19 22 16

CO. MEATH

WARRENSTOWN 136.7 217 21.2 12 19 14

CO. MONAGHAN

CLONES 123.4 184 17.0 19 22 16

CO. OFFALY

BIRR 123.6 203 12.7 14 25 21 DERRYGREENAGH 151.0 232 23.8 14 23 19

CO. SLIGO

ARDTARMON 106.6 12.3 14 19 19 16

CO. TIPPERARY

FETHARD (PARSONSHILL) 114.3 16.8 12 25 21

CO. WATERFORD

WATERFORD (TYCOR) 142.9 204 23.8 12 17 24 19 DUNGARVAN (CARRIGLEA) 134.1 25.0 17 22 19

CO. WESTMEATH

MULLINGAR II 133.3 188 25.5 14 24 18

CO. WEXFORD

JOHNSTOWN CASTLE 140.0 219 19.9 17 23 18 ROSSLARE 108.3 197 19.3 7 21 19 JOHN F. KENNEDY PARK 147.2 204 23.0 21 22 18 CLONROCHE (KNOXTOWN) 155.9 32.2 21 24 22

County/

Station

Total % of

Number of

Amount 1961-90 Most in

Raindays Wetdays

(mm) average a day / date (>0.2mm) (>1mm)

Wetter than

normal

everywhere;

wettest on record

at Valentia

(11)

11

RAINFALL

TToottaall rraaiinnffaallll ((m

mm

m))

PPeerrcceennttaaggee ooff nnoorrm

maall rraaiinnffaallll

00 55 1100 1155

11 22 33 44 55 66 77 88 99 1100 1111 1122 1133 1144 1155 1166 1177 1188 1199 2200 2211 2222 2233 2244 2255 2266 2277 2288 2299 3300 3311

Valentia Observatory

Dublin Airport

Clones

(12)

12

TEMPERATURE

Temperatures were a little higher than normal

over the country, by between half a degree and

one degree generally. Mean air temperatures

overall ranged from 10.1°C at Knock Airport to

12.3°C at Dublin (Merrion Square). While it was

the warmest May for 5 years at Casement

Aerodrome, it was the coolest since 1996 at

Valentia Observatory.

Although temperatures were above normal

throughout most of May, there was a spell of cool

weather between the 20th and 25th, when both

daytime and nightime values were several degrees

below normal. These conditions were associated with

a north to northwesterly airstream over Ireland as an

area of low pressure was slow-moving to the east of

the country. No air frost was recorded, but ground

frost was fairly widespread between the 22nd and

25th and also on the 31st. The lowest air temperature

of the month, 0.0°C, was measured at Ballincurrig

(Peafield), Co. Cork, on the 23rd, while the lowest

grass minimum value, -5.8°C, was recorded at

Derrygreenagh, Co. Offaly, on the same day. The

highest temperatures were measured in the period

10th to 12th, with the highest value of 24.2°C

recorded at Galway (University College) on the 11th.

Mild throughout

most of month

00 55 1100 1155

11 22 33 44 55 66 77 88 99 1100 1111 1122 1133 1144 1155 1166 1177 1188 1199 2200 2211 2222 2233 2244 2255 2266 2277 2288 2299 3300 3311 1100

1155 2200 2255

11 22 33 44 55 66 77 88 99 1100 1111 1122 1133 1144 1155 1166 1177 1188 1199 2200 2211 2222 2233 2244 2255 2266 2277 2288 2299 3300 3311

Daily 0-24h maximum temperatures

(°C)

Daily 0-24h minimum temperatures (°C)

‹

Valentia Observatory

‡

Dublin Airport

z

Clones

‹

Valentia Observatory

‡

Dublin Airport

z

Clones

M

Meeaann TTeem

mppeerraattuurree

(difference from 1961-90 normals)

SCALE +1.0°C

+0.6°C

-1.0°C

+1.0°C +0.5°C

+0.5°C

+0.9°C +0.7°C

+0.2°C

+0.9°C

+0.5°C +0.1°C

+1.0°C

(13)

13

TEMPERATURE

CO. CAVAN

CAVAN (LORETO COLLEGE) 15.4 7.1 11.3 22.0 11 1.2 23 -1.0 23 0 1

CO. CLARE

SHANNON AIRPORT 15.2 8.1 11.7 0.2 22.0 11 3.7 30 0.0 23 0 0 CARRON 14.7 7.1 10.9 0.9 21.7 11 2.2 23 -2.3 23 0 4

CO. CORK

FERMOY (MOORE PARK) 15.5 7.4 11.5 1.0 20.0 10 0.2 23 -4.5 23 0 9 CORK AIRPORT 14.0 7.5 10.8 0.5 18.0 26 2.5 23 0.0 23 0 0 SHERKIN ISLAND 14.4 8.8 11.6 0.6 16.9 20 5.0 30 1.9 30 0 0 BALLINCURRIG (PEAFIELD) 15.2 6.3 10.8 20.5 11 0.0 23 -2.0 23 0 2

CO. DONEGAL

MALIN HEAD 13.3 8.0 10.7 0.6 17.3 11 4.4 23 1.4 23 0 0 BALLYSHANNON(CATHLEEN'S FALL) 14.6 7.7 11.2 0.7 22.9 11 2.6 23 0 GLENTIES 15.1 6.6 10.9 0.9 22.5 10 0.1 24 0.1 25 0 0

CO. DUBLIN

DUBLIN (PHOENIX PARK) 15.7 7.1 11.4 1.0 22.4 12 1.0 23 -0.7 31 0 1 DUBLIN AIRPORT 15.1 7.0 11.1 20.1 12 1.3 23 -2.5 23 0 3 CASEMENT AERODROME 15.6 7.2 11.4 1.0 21.3 11 12 1.0 31 -3.0 31 0 3 DUBLIN (MERRION SQUARE) 15.2 9.3 12.3 0.7 20.7 12 5.1 23 0

CO. GALWAY

GALWAY (UNIV.COLL.) 15.7 7.6 11.7 0.6 24.2 11 2.5 25 -0.5 24 0 2 MAAM VALLEY 15.1 7.9 11.5 21.9 11 3.1 23 25 0.5 23 0 0 CONNEMARA NATIONAL PARK 14.4 7.6 11.0 20.4 11 3.8 23 0 BALLYGAR 14.7 5.8 10.3 18.2 9 3.4 5 2.0 1 0 0

CO. KERRY

VALENTIA OBSERVATORY 13.7 8.5 11.1 0.1 16.0 10 4.6 9 10 0.0 30 0 0 ARDFERT (LISCAHANE) 15.6 7.7 11.7 1.1 19.8 11 2.3 30 -1.8 30 0 3

CO. KILKENNY

KILKENNY 15.5 7.3 11.4 0.9 21.7 10 11 1.2 23 -3.6 23 0 5

CO. LIMERICK

MOUNT RUSSELL 14.6 7.3 11.0 21.0 11 3.3 30 -1.4 30 0 2

CO. LOUTH

ARDEE (BOHARNAMOE) 15.4 7.1 11.3 1.2 20.6 11 1.1 23 0.2 23 0 0

CO. MAYO

BELMULLET 14.6 8.3 11.5 1.0 21.6 11 3.5 25 1.2 25 0 0 STRAIDE 14.9 7.0 11.0 0.7 22.9 11 0.1 25 -3.8 23 0 6 KNOCK AIRPORT 13.5 6.7 10.1 20.9 11 1.8 23 -1.4 25 0 2

CO. MEATH

WARRENSTOWN 15.4 7.0 11.2 0.9 21.1 11 2.1 23 0.4 31 0 0

CO. MONAGHAN

CLONES 14.8 7.1 11.0 0.7 22.4 11 1.2 23 -2.7 23 0 4

CO. OFFALY

BIRR 15.1 7.0 11.1 0.5 22.5 11 2.2 30 -3.1 23 0 6 DERRYGREENAGH 15.5 6.8 11.2 1.2 22.3 11 1.1 23 -5.8 23 0 11

CO. SLIGO

ARDTARMON 15.2 8.0 11.6 21.6 11 4.0 23 2.1 13 0 0

CO. TIPPERARY

FETHARD (PARSONSHILL) 15.0 6.9 11.0 21.2 11 1.4 23 0.0 23 0 0

CO. WATERFORD

WATERFORD (TYCOR) 15.4 9.0 12.2 1.3 20.5 11 3.9 23 0 DUNGARVAN (CARRIGLEA) 15.6 7.8 11.7 0.9 19.7 26 0.5 23 -0.4 23 0 1

CO. WESTMEATH

MULLINGAR II 14.7 6.7 10.7 0.5 21.6 11 0.5 23 -3.1 23 0 4

CO. WEXFORD

JOHNSTOWN CASTLE 15.4 8.1 11.8 1.5 20.6 26 3.8 23 -0.1 31 0 1 ROSSLARE 14.2 8.8 11.5 0.9 18.8 12 4.0 23 0.6 23 0 0 JOHN F. KENNEDY PARK 14.9 7.5 11.2 0.6 21.0 26 1.0 23 -0.2 23 0 1 CLONROCHE (KNOXTOWN) 14.8 6.9 10.9 20.4 11 0.5 23 -3.6 23 0 6

Mean/ deviation

Mean Mean from 1961-90 Highest Lowest Lowest Days with max. min. average max./date min./date grass min./date air frost ground frost

County/

Station

(14)

14

SUNSHINE

CO. CAVAN

CAVAN (LORETO COLLEGE) 5.23 32 12.4 24

CO. CLARE

SHANNON AIRPORT 5.14 89 33 14.2 30

CO. CORK

FERMOY (MOORE PARK) 4.32 77 27 14.2 31 CORK AIRPORT 5.00 83 32 14.8 30 SHERKIN ISLAND 5.89 87 38 14.9 30 BALLINCURRIG (PEAFIELD) 4.76 13.9 31

CO. DONEGAL

MALIN HEAD 7.49 121 46 14.2 11 BALLYSHANNON(CATHLEEN'S FALL) 6.07 113 38 12.3 10

CO. DUBLIN

DUBLIN AIRPORT 6.35 105 40 14.2 31 CASEMENT AERODROME 6.22 107 39 14.0 31

CO. GALWAY

GALWAY (UNIV.COLL.) 5.65 97 36 12.9 30

CO. KERRY

VALENTIA OBSERVATORY 4.96 85 32 15.0 31 ARDFERT (LISCAHANE) 5.15 33 13.1 30

CO. KILKENNY

KILKENNY 4.81 88 30 14.4 31

CO. MAYO

BELMULLET 6.33 103 40 13.1 24 STRAIDE 5.84 12.8 30 KNOCK AIRPORT 5.56 13.1 10

CO. MONAGHAN

CLONES 5.49 104 34 13.2 10

CO. OFFALY

BIRR 4.77 90 30 11.8 10

CO. WATERFORD

DUNGARVAN (CARRIGLEA) 5.12 87 33 12.7 11

CO. WESTMEATH

MULLINGAR II 5.45 98 34 13.4 24

CO. WEXFORD

JOHNSTOWN CASTLE 4.46 28 13.8 31 ROSSLARE 5.76 84 37 15.0 31 JOHN F. KENNEDY PARK 4.72 86 30 13.1 31 CLONROCHE (KNOXTOWN) 4.91 14.9 31

Sunny in north,

dull in south

May sunshine totals were higher than

normal in the north and east of the

country but below normal in the south.

They ranged from 134 hours, or 77% of

normal, at Fermoy (Moorepark), Co.

Cork to 232 hours, or 121% of normal, at

Malin Head. While it was the sunniest

May for 6 years at Malin Head, it was the

dullest for 7 years at a number of

stations.

Sunshine amounts were limited throughout

most of the month, but there were very

sunny periods between the 10th and 11th

and again between the 29th and 31st. The

highest daily value, 15.0 hours, was recorded

at both Rosslare and Valentia Observatory

on the 31st. Global solar radiation totals

ranged from 86% of normal at Valentia

Observatory to 113% at Belmullet.

Daily mean % of % of Most in (hours/day) average possible a day/date

County/

Station

00 55 1100 1155

11 22 33 44 55 66 77 88 99 1100 1111 1122 1133 1144 1155 1166 1177 1188 1199 2200 2211 2222 2233 2244 2255 2266 2277 2288 2299 3300 3311

Daily sunshine values(hours)

Valentia Observatory

Dublin Airport

Clones

TToottaall SSuunnsshhiinnee

(difference from 1961-90 normals)

SCALE 150%

50%

104%

89%

107% 98%

103%

90%

121%

83% 85%

84% 88%

(15)

15

WORLD WEATHER

Global weather

highlights of

the month

Drought in China threatens supplies of drinking water to nearly 14 million people in the northern part of the country. About 16.3 million hectares of agriculture land, or more than 12 percent of the nation's total, is affected by drought. Temperatures in parts of central Spain

on the 17th set new maximum records for May, including 38.4°C at Toledo and 39.5°C at Cordoba. Madrid's Barajas airport recorded 36.2°C, its highest May temperature since 1953.

Torrential rainfall in Surinam during early May produced the worst disaster in recent times in the interior of the country. Flooding affected at least 25,000 people, and between 25,000 and 30,000 square kilometers of the interior were submerged by water.

In India, a heatwave during early May produced temperatures above 40°C and resulted in at least 53 fatalities. Heatwaves are common in May in south Asia before the traditional onset of the rainy season in late May and early June. Rainfall accumulations of between

300 and 430mm in the period 13th to 16th caused massive river flooding in New England, forcing the evacuation of thousands of people from their homes. Boston recorded a 96-hour total of 216mm, the second largest such fall in the station’s 134-year history.

May 2006

MAY RAINFALL

(percentage of

1961-1990 normal)

MAY MEAN TEMPERATURE

(difference from

1961-1990 normal)

%

200

150

125

100

75

50

0

Data supplied by NOAA Climate Prediction Centre, US Department of Commerce

+5

+3

+1

-1

-3

(16)

16

SPRING 2006 SUMMARY

May 2006

County/

Station

RAINFALL

(mm)

TEMPERATURE

(°C) SUNSHINE(HOURS)

N

O

.

OF DAYS WITH

:

Total Daily

mean diff. from Extremes

Mean average Highest Lowest

Rain Snow Air frost Hail Thunder Fog Gale gusts

CO. CLARE

SHANNON AIRPORT 262.0 140 17.3 21 May 9.0 0.0 22.0 -5.8 5.05 106 14.7 1 Jun 55 3 8 4 2 6 20

CO. CORK

CORK AIRPORT 284.0 114 30.2 21 May 8.4 0.4 18.0 -4.0 4.80 96 15.2 1 Jun 55 4 7 4 1 23 22

CO. DONEGAL

MALIN HEAD 251.3 123 18.1 11 Mar 8.3 0.4 17.3 -1.5 5.39 114 14.2 11 May 67 5 3 18 0 3 50

CO. DUBLIN

DUBLIN AIRPORT 227.7 22.9 21 May 8.2 20.1 -5.8 5.44 108 14.2 31 May 58 5 12 5 2 5 24 CASEMENT AERODROME 156.4 99 17.4 21 May 8.4 0.5 21.3 -7.5 5.00 106 14.0 31 May 53 4 16 7 3 3 25

CO. KERRY

VALENTIA OBSERVATORY 440.2 152 28.8 21 May 9.2 0.1 16.0 -2.8 4.66 98 15.3 1 Jun 64 3 3 3 0 1 19

CO. KILKENNY

KILKENNY 201.9 114 19.4 21 May 8.8 0.6 21.7 -5.1 4.94 106 15.0 1 Jun 57 n/a 11 -- n/a -- 8

CO. MAYO

BELMULLET 302.3 136 19.6 6 May 9.1 0.6 21.6 -4.6 5.03 101 13.1 24 May 69 4 5 12 3 4 30 KNOCK AIRPORT 354.5 22.0 19 May 7.4 20.9 -4.5 4.63 15.4 1 Jun 70 8 9 3 1 25 17

CO. MONAGHAN

CLONES 316.9 158 15.4 14 May 8.1 0.3 22.4 -6.6 4.75 109 14.8 1 Jun 63 n/a 13 -- n/a -- 15

CO. OFFALY

BIRR 244.9 139 15.8 14 May 8.4 0.3 22.5 -7.8 4.56 102 14.4 1 Jun 60 n/a 9 -- n/a -- 11

CO. WESTMEATH

MULLINGAR II 303.5 149 26.2 14 May 8.0 0.3 21.6 -7.2 4.98 107 15.3 1 Jun 68 n/a 14 -- n/a -- 1

CO. WEXFORD

ROSSLARE 235.4 131 19.3 8 May 9.1 0.6 18.8 -2.3 5.31 95 15.3 1 Jun 47 2 5 3 1 10 34

% of average

Most in a day

amount date(s) amount date(s)Most in a day

Although rainfall totals for the season were near

normal in parts of Dublin, the season was a wet

one generally and was very wet in parts of the

midlands, west and southwest (see map on right). It

was the wettest spring for between 9 and 20 years

in many places and the wettest in over 50 years of

record at both Mullingar and Clones. March and

May were both wetter than normal months, while

totals for April were above normal in the north

and west but were well below the average in the

south and southeast. The number of wetdays

(days with 1mm or more rainfall) measured during the

season was well above normal everywhere; there

were between 40 and 55 wetdays generally

compared with the normal range for spring of

between 32 and 42. The heaviest daily falls at

almost all stations were recorded on May 21st.

Mean air temperatures for the season were near or a

little higher than normal, but it was nevertheless the

coolest spring for between 5 and 10 years. March was a

cold month generally, while both April and May were a

little warmer than normal. Exceptionally low

temperatures for spring were measured during early

March, including a grass minimum value of -16.0°C

recorded at Birr on the 3rd, its lowest value for spring

since such records began there in 1954. Sunshine totals

for the season were close to normal in most places but

totals were above normal in the north. April was a

very sunny month- the sunniest on record in places,

while March was dull and May totals were near

normal. More than 14 hours of sunshine were

recorded at most stations on May 31st. The highest

gust of the season, 55 knots (102km/hour) was

recorded at Belmullet on March 9th.

Very wet in many places;

a little warmer & sunnier

than normal

The Weather of March, April and May

% of

average

SCALE 150%

50%

158%

140%

99% 149% 136%

123%

140%

114% 152%

131% 114%

139%

Figure

Updating...

References

Updating...