Statistics & Summaries May 2014

[TonyH]

Llanwnnen, Lampeter, Ceredigion, Wales 126masl

 

Dull and wet but mild

 

Overall an unsettled but warmer than average May this. There was a short dry, very warm and quite sunny spell mid month, but with otherwise mediocre and, at times, wet weather.

 

1^st – 4^th: Mainly dry after a little rain 1^st. Mild with a few sunny intervals

 

5^th – 13^th: Rather cloudy spell with rain at times, some heavy. 17.4mm 10^th. Temperatures close to average but cool 10^th/ 11^th maxima around 13c. It was also quite windy at times.

 

14^th – 18^th: Dry and warm/ very warm with plenty of sunshine. High pressure over southern UK some decent sunny periods, and quite high temperatures by day but some clear, cool nights. 15^th to 18^th all reached above 20c, there were 2 likely ground frosts on 14^th and 17^th when it got down close to 2c, although I did not have a thermometer on the lawn and was not up early enough to witness this!

 

19^th – 21^st: Warm, and unsettled with some showery rain. It continued warm, the months highest reading of 22.4c 19^th. The 19^th also saw several thunderstorms pass by, with some much more distant ones just after midnight which nevertheless produced spectacular lightning. However, rainfall amounts during this period were only small and 21^st was dry and sunny.

 

22^nd – 25^th: Dull, rather cool and unsettled. Less than one hours sun in total for these 4 days, with heavy rain at times, the months highest daily fall of 17.5mm being on 24^th.

 

26^th – 31^st: Mostly dry and sometimes warm, limited sunshine. A few spits and showers but only a few sunny intervals, light winds.

 

Total rainfall: 103.2mm (134% LTA)

Wettest day: 17.5mm 24^th

Rain days >0.2mm: 19
Wet days >1.0mm: 15
Days of heavy rain >10mm: 3

Mean temperature: 11.9c

Mean Max: 16.7c

Mean Min: 7.1c

 

High Max: 22.4c 19^th
Low Max: 12.5c 22^nd
High Min: 11.2c 20^th
Low Min: 2.2c 14^th

 

Est sun: 115hr

Max sun: 12.5 hours 21^st

Days no sun: 1

Air frost: 0

Ground frost: 2

Mean RH: 84%

High RH: 100% various
Low RH: 40% 16^th

Predominant wind direction: SW
Mean wind speed: 3.9mph

Mean pressure: 1015mbar 
Max pressure: 1037mbar 15^th
Min pressure: 998mbar 10^th

 

Days with:
 

Hail: 0
Gale: 0
Thunder: 1

Lightning only: 1

Snow or sleet 0

Snow lying 0900: 0
Fog: 2

Fog at 0900: 0

 

Edited June 1, 2014 by TonyH

[johnholmes]

Cantley May summary

 

A very wet month, double my 10 year average and possibly about the 3^rd ever wettest with statistics for this area back to 1942

 

About average temperatures thanks to warmer nights than average

 

One thunderstorm, no fog, air frost (1 ground frost) hail or snow.

 

 

Mean T=13.5 (13.0)

Avge Max=17.9 (17.8 )Highest=26.3 on 19^th and lowest daytime max was 11.2 on 1st

Avge Min=9.2 (8.2) Lowest overnight 0.4 on 3^rd and warmest night was 27^th with 11.2

 

Rainfall=76.6mm (34.8 ) with 14.2mm on 22^nd the wettest, 18 days with 0.2mm or more and 14 with 1.0mm or more

Edited June 1, 2014 by johnholmes

[Styx]

 

Hobart, Tasmania in May ( 3rd month of autumn )

This was the sixth month in a row with above-average temperature and below-average rainfall, but not by big margins.

Temperature anomalies ( below ) compared to period 1981-2010.

 

Average maximum:  15.6 ( +0.5 )

Average minimum:  7.7 ( +0.1 )

Rainfall:  31mm ( average 45mm )

Rain days ( +1mm ):  7/from 17

 

May temperature extremes ( Records since 1881 )

Highest maximum:  23.9 15th ( Record 25.7 in 1997 )

Lowest maximum:  9.2 31st ( Record 6.1 in 1921 )

Highest minimum:  14.9 16th ( Record 16.2 in 2005 )

Lowest minimum:  2.4 9th ( Record -1.6 in 1902 )

 

The month: Rather cold and cloudy during the first week with scattered showers, and light snow near 1000m but only for a time. Thereafter, high pressure moved in from the west - initially cool and clear, then exceptionally mild mid-month as the high settled to the east. A steady stream of weakening cold fronts however brought short periods of patchy light rain, or a shower or two as winds temporarily turned cool onshore southerly. An evening change on the 27th brought a band of rain followed by a cold but dry airmass, and clear skies to see out the month.

[SP1986]

May 2014 Statistics

May was a month I could describe as fairly average, though days were often just above average, nights were often below to average. There was a threat of some unseasonably cool weather towards the end of the month which never truly materialised, although the night minimums will go down as consistent low and not particularly varied, as with normal. The highest temperature was 26C.. around average in the long term expectations for May. Other than that, May was very wet, going against the grain for tradition.. which normally has May as one of the drier months of the year.

Below are the statistics for my weather station during the month of May

Mean Maximum: 17.4C
Mean Minimum: 8.9C
Overall Mean: 13.15C

Monthly Rainfall total: 85.8mm
Rainfall days: 16 days
Max rainfall in one day: 13.7mm (19th May)
Total Snowfall: 0cm
Snowfall Days (Snow falling): 0cm
Max snowfall in one day: 0cm

Highest daily maximum temperature: 26.2C (19th May)
Lowest daily maximum temperature: 12.4C (12th May) 
Highest daily minimum temperature: 11.8C (27th May)
Lowest daily minimum temperature: 3.5C (3rd May)

Days with Ground Frost: 0
Days with Air Frost: 0
Days of falling Sn*w: 0
Days of lying Sn*w: 0
Thunder days: 1

Temperature frequency breakdown

Maximum temperature:
10.0C to 14.9C: 10 days
15.0C to 19.9C: 12 days
20.0C to 24.9C: 8 days
25.0C to 29.9C: 1 day

Minimum temperature:
0.0C to 4.9C: 1 day
5.0C to 9.9C: 21 days
10.0C to 14.9C: 9 days

Compared to the Colwyn Bay May average (81-10 average = 11.45C), my average comes in at +1.7C above the Colwyn Bay average, making it an above average month

Edited June 8, 2014 by SP1986