May Weather Statistics

[Zenarcher]

Castlebay Isle of Barra May 2011

Highest Temperature 17.6°C

Lowest Temperature 6.2°C

Average Temperature 10.5°C

Total Rainfall 131.2mm

Highest Humidity 97%

Lowest Humidity 48%

Average Humidity 82.4%

Average Wind Speed 21.2mph

Highest Gust 70mph

Highest Pressure 1019.9mb

Lowest Pressure 977.9mb

Lowest Wind Chill -4°C

Highest Dew Point 12.8°C

Lowest Dew Point 0.4°C

Average Dew Point 7.5°C

After a dryer and warmer than usual April, May has been a bit cooler than April with double the amount of rainfall.

[Optimus Prime]

May

Mean maximum 18.4c (+1.4c)

Mean Minimum 9.0c (+1.3c)

Mean 13.7c (+1.4c)

Highest maximum 24.3c (6th)

Lowest maximum 15.3c (15th)

Lowest minimum 1.8c (4th)

Highest minimum 14.5c (9th)

Continuing the very dry and very warm theme since November 2010 in particular (the dry theme) It was also a windy month bringing condions closer to what you'd expect in the middle of a hot summer. After an incredibly warm April, the mean maxima was way beloow Aprils average and 0.1c below April as a whole.

The frequency of +20c days were reduced in comparison to April

Edited June 1, 2011 by Optimus Prime

[Summer of '47]

May was the third consecutive very dry month here with only 23% of the average rainfall. The rain was generally in the form of short although sometimes sharp showers with thunder on one day. The month ended with temperatures a little above average; daily maxima were very unexceptional and unusually below that of the (exceptional) April, no days could be described as hot. Sunshine hours were a little above average at 227 hours.

Daily brakdown at http://www.tonbridge...011/2011-05.htm

[TonyH]

May 2011

Quite mild, windy and unsettled; average rainfall

May was often changeable and windy, with rain or showers at times, falling on 23 days although generally quite light. Disappointingly average after a warm start and the exceptional April.

1^st- 7^th: Warm and mostly dry but breezy. Sunny spells. Temperatures up to 21c.

8^th- 20^th: Unsettled and often windy with some rain or showers at times, although these were rarely heavy. Sunny spells at times too with temperatures average to rather warm, but ground frosts occurred on the 13^th and 14^th.

21^st- 27^th : Windy and unsettled, rain or showers, heavy at times. Near gale force winds at times. Around average temperatures, although cool on the 26^th (max 13c). Still some sunny spells on most days.

28^th- 31^st: Rather unsettled, some rain or showers and some sunshine. Breezy with near average temperatures.

Statistics

Total rainfall: 86.7mm

Wettest day: 13.5mm 21^st

Rain days >0.2mm: 23

Wet days >1.0mm: 18

Days of heavy rain >10mm: 1

Mean temperature: 12.1c

Mean max: 16.9c

Mean min: 7.3c

High max: 21.3c 6^th

Low max: 13.1c 26^th

High min: 11.8c 7^th

Low min: 0.7c 13^th

Air frost: 0

Ground frost: 3

Mean RH: 77%

High RH: 95% 14^th

Low RH: 34% 2^nd

Predominant wind direction: SSE

Mean wind speed: 2.2mph

Mean pressure: 1016mbar

Max pressure: 1028mbar 24^th

Min pressure: 1002mbar 26^th

Days with:

Hail:2

Sleet or snow: 0

Gale: 0

Thunder: 0

Lightning seen without thunder: 1

Fog: 0

Fog at 0900: 0

Notes to graph: a little data is missing

Max temperatures adjusted downwards at times, this not apparent from the graph though.

Edited June 1, 2011 by Tonyh

[johnholmes]

Cantley data for May 2011

temperatures are in degrees C and long term averages in brackets

Mean Max=18.6(16.2) Highest daytime=22.9 on 6th, lowest daytime=13.6 on 30th

Mean Min=8.8(6.4) lowest min=0.4 on 4th and highest min=14.6 on 8th

Mean=13.7(11.3)

Total rainfall=31.2mm with 11.0mm on 8th being the wettest; 10 days with 0.2mm or more and 4 with 1.0mm or more

no air frosts and 1 ground frost

No fog at 0900 clock time, no snow and no hail.

The wettest! month since February and another month when Max, Min and Mean all exceeded by 2C or more the long term average.

Just a brief look at some data for the spring(March 1-31May)

Mean temperatures were 3.2C above the long term average

Two pieces of data from Davis on my weather site

Temperature and rainfall

Edited June 1, 2011 by johnholmes

[Chris D]

May 2011 Stats for Southport

Max Temp: 21.6c (6th)

Min Temp: 2.8c (4th)

Average Max: 16.9c

Average Min: 9.4c

Mean Temp: 13.1c

Average Pressure: 1014 mB

Total Rainfall: 38.0 mm

[Lancashire Lass]

Summary for May 2011 for Preston, Lancs.

Temperature (°C):

Mean (1 minute) 12.6

Mean (min+max) 13.0

Mean Minimum 8.6

Mean Maximum 17.3

Minimum 3.0 day 04

Maximum 23.1 day 06

Highest Minimum 12.8 day 07

Lowest Maximum 12.0 day 16

Air frosts 0

Rainfall (mm):

Total for month 53.7

Wettest day 7.5 day 16

Rain days 21

Wind (mph):

Highest Gust 30.4 day 23

Average Speed 2.8

Wind Run 2121.5 miles

Gale days 0

Pressure (hPa):

Maximum 1038.8 day 24

Minimum 1014.1 day 26

Days with snow falling 0

Days with snow lying at 0900 0

[Thundery wintry showers]

Weather stats for May 2011, Cleadon, Tyne and Wear (all averages estimated for 1971-2000)

Mean Maximum 16.0C (+2.1)

Mean Minimum 8.7C (+2.0)

Mean Temp 12.4C (+2.1)

Highest Maximum 20.6C (8th)

Lowest Maximum 12.5C (3rd)

Highest Minimum 11.8C (18th)

Lowest Minimum 1.6C (4th)

Total precipitation 19mm (37%)

Highest daily total 15mm (7th)

Total days >1mm precipitation: 5

No days with sleet/snow, thunder, fog, but 1 day of hail.

This was the warmest May recorded at Cleadon in a record going back to 1993- May 2001 had a higher average maximum and May 1998 had a higher average minimum, but the mean for May 2011 just exceeded that for the previous warmest Mays in 1998 and 1999. Presumably the very "westerly" nature of May, preventing sea breezes from developing, was the main reason why it turned out so warm. The warmth was consistent rather than outstanding, with only one significantly colder-than-average night and no significantly colder-than-average days.

The first half of May was mostly sunny with notably warm temperatures by day and near-average temperatures by night. Although there was a very wet day on the 7th, the subsequent sunshine-and-showers days saw Cleadon dodge a large majority of the showers, hence the low monthly rainfall total. The second half of the month was much cloudier, with temperatures mostly slightly above average by day, and much above average by night. Met Office sunshine maps suggest that sunshine for the month probably came out a little above normal.

With two of the three spring months setting new records and March slightly warmer than average, Spring 2011 just pipped Spring 2007 as the warmest spring since I began recording, and it was the driest, too, with only 43mm of rain (29% of the estimated average for 1971-2000). It was the first spring without any days of sleet/snow falling since 2003.

[Andy Bown]

May 2011 (14.12c) wasn't as warm as 2008 (14.70c) but was the driest I have recorded since beginning my records

in summer 2003. Of the 51.5mm rainfall, 25mm fell in just a few hours overnight on the 7th-8th! This was the first

time that the May average max was cooler than the preceding Aprils' average max. Intruguingly the highest and lowest

temperatures of the month came within just a few days.

For Warminster, Wiltshire ...

Average max = 19.15c (Highest = 24.6c on 6th May)

Average min = 9.10c (Lowest = 3.3c on 4 May)

Mean = 14.12c

Dry days = 17

Rain days = 14

Rainfall = 51.5mm

[Osbourne One-Nil]

A pretty average month with the overall mean temperature being just 0.1º different from the 13yr mean. Below average daily maximums though and above average nightly mins.

Average daily high; 14.7º

HIghest daily maximum; 19.2º (6th)

Lowest daily maximum; 11.8º (28th)

Average daily minimum; 6.5º

HIghest daily minimum; 12.3º (7th)

Lowest daily minimum; -2.2º (4th)

Monthly mean temperature; 10.6º (13yr mean; 10.7º)

No. of air frosts; two

Total rainfall; 104.4mm (total for year to end of month 571.6mm)

No. of wet days (0.2mm or above); twenty-two

Wettest day; 24.2mm (23rd)

Highest wind gust; 47mph (23rd)

[damianslaw]

A pretty average month with the overall mean temperature being just 0.1º different from the 13yr mean. Below average daily maximums though and above average nightly mins.

Average daily high; 14.7º

HIghest daily maximum; 19.2º (6th)

Lowest daily maximum; 11.8º (28th)

Average daily minimum; 6.5º

HIghest daily minimum; 12.3º (7th)

Lowest daily minimum; -2.2º (4th)

Monthly mean temperature; 10.6º (13yr mean; 10.7º)

No. of air frosts; two

Total rainfall; 104.4mm (total for year to end of month 571.6mm)

No. of wet days (0.2mm or above); twenty-two

Wettest day; 24.2mm (23rd)

Highest wind gust; 47mph (23rd)

Your stats back up my perception of May as being preety average temp wise with slightly below average maxima cancelled out by warmer minima thanks to persistant westerly airstreams and also a wet month. Not sure of sunshine levels but I suspect these were preety average. For the northwest quarter of the country Cumbria, SW Scotland, W/NW Scotland and N Ireland - May 2011 overall was preety dissapointing considering how with June it is usually the best month of the year for settled weather and with April the driest month of the year. I still say April and May 2011 happened the wrong way round.