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MAY 2010 daily and monthly summary

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MAY 2010
June

1st - 7th
1st to 3rd a poor Bank Holiday weekend. 1st, LP 989 hPa Gulf of Bothnia, LP 1006 hPa NW of Ireland, two spells of light rain showers early am. 2nd, LP 1008 hPa near IoW, troughs and fronts bring intermittent light/moderate rain most of the day with some heavy bursts in the morning, temperature falls steadily through the day. 3rd, sunny spells with light rain shower pm. 4th, sunny start and end to the day but cloudy for most of the day. 5th, HP 1033 hPa at 20°W of Ireland, LP 1000 hPa Corsica, only brief sunny intervals during another cloudy day. 6th, mainly sunny after 10am, 7th, mostly cloudy with some light drizzle nighttime.
8th - 13th
Sat 8th, a dismal day of mainly overcast gloom with intermittent light rain/drizzle. 9th, LP 992 hPa Finisterre, LP 1002 hPa Norwegian Sea, blocking HP 1033 hPa between Iceland and Greenland, persistent overcast only breaks up toward evening. 10th, cloudy start, sunny pm. 11th, mainly overcast again with some light rain pm. 12th, mainly cloudy after sunny start, rain shower just after noon. 13th, LP 992 hPa just SE of Iceland, HP 1034 hPa north of Azores, another sunny start clouding over by midmorning.
14th - 20th
Winds start to veer away from the N and NE, generally the same pattern of sunny starts to the day but cloudy by midmorning. 14th, long sunny spells, 15th sunny am, then cloudy until late pm gave sunny intervals. 16th, LP 1000 hPa Faeroe Is, LP 1000 hPa Denmark, HP 1027 hPa N Spain, cloudy day after sunny start, occluded front gives 2 hours moderate rainfall evening/early night. 17th & 18th, yet again sunny starts with cloud later, 19th & 20th the same, early sunshine giving way to cloud before a sunny end to the day.
21st - 25th
A sunny and warm spell. 23rd HP 1021 hPa Straits of Dover. Maximum temperature of 28.6 °C on the 24th is the highest May temperature here since 27 May 2005 (30.9 °C) and 2nd highest May temperature at this site.
26th - 31st
Much cooler and fresher. 26th LP around the UK except the SW. 27th, LP 1005 hPa N of Scotland moving SE, occluded front brings rain am, sunny mid pm onwards. 28th, sunny start, cloudy later then sunny spells. 29th, LP 1001 hPa southern Ireland, set of fronts push through from late morning through the whole day bringing light rain showers, one - briefly - with hail. 30th, cloudy am, sunny periods pm. 31st, cloudsheets moving from NE broken only very briefly by sunshine.

MAY 2010 MONTHLY SUMMARY
ACTUAL TEMPERATURE
 AVERAGE
 Daily Maximum
16.9
 ºC ( -0.6C )*
 Daily Minimum
7.0
 ºC ( -1.4C )*
 Daily Mean
11.47
 ºC (c -1.1C )*
 EXTREMES
 High Maximum
28.6
 ºC ( 24th )
 Low Minimum
1.5
 ºC ( 12th )
 Low Maximum
8.8
 ºC (  2nd )
 High Minimum
12.1
 ºC ( 21st )
 
   
 Days with max => 20 °C
5
  ( -3 )*
 Days with min <5 °C
9
  ( +5 )*
 Days with air frost
0
  ( ±0 )*
 
PRECIPITATION
 Monthly Total
24.3
 mm ( 53% )*
 Days with measurable precip
9
 Days ( -2 )*
   ...of which, days with >= 1.0 mm
6
 Days ( -3 )*
   ...and days with snowfall observed
0
 Days  
 Days with Hail
1
 Days  
 Days with Thunder
0
 Days  
 RAIN RATE & EXTREMES
 High Rain Rate
28.7
 mm/hr ( 16th)
 High Rain Total in 1 day
10.7
 mm (  2nd )
 High Rain Total in 1 hour
3.8
 mm ( 2nd, 10.10h)
 EVAPO-TRANSPIRATION
 Total for month
79.8
 mm  
 High Total for 1 day
5.0
 mm ( 24th )
APPARENT TEMPERATURE
 Low Wind Chill
1.6
 ºC ( 12th )
 DAVIS HEAT INDICES THW & THSW
 Low Temp/Hum/Wind Index
1.4
 ºC ( 12th )
 High Temp/Hum/Wind Index
27.6
 ºC ( 23rd )
 High Temp/Hum/Sun/Wind Index
34.1
 ºC ( 23rd )
 
DEWPOINT & HUMIDITY
 High Dewpoint
13.4
 ºC ( 21st )
 Low Dewpoint
-3.2
 ºC ( 13th )
 Average Dewpoint at 14h
52
 ºC  
 Low Relative Humidity
20
 % ( 24th )
 Average RH at 14h
5.1
 %  
WIND SPEED & DIRECTION
 Monthly Average
1.5
 mph  
 Windiest day (Average)
4.3
 mph ( 3rd )
 Highest Gust
21
 mph ( 2nd & 3rd )
 Dominant Direction
N
 ( 31% )
 
BAROMETER
 Monthly Mean
1016.0
 hPa  
 High Barometer
1031.3
 hPa ( 20th )
 Low Barometer
1005.4
 hPa ( 29th )
SUNSHINE
 Max Sensor Exposure to direct sun
10
 hours/day (15-16 possible)
 Calculated Monthly Sunshine Hours
126.6
 hours  
 Estimated Actual Hours (approx)
167.0
 hours  
 Sunniest Day Measured
9.3
 hours ( 21st )
 Days with no sunshine
2
 Days  
 
FOG
 Number of Days with Fog
0
 Days  
NEW RECORDS SET THIS MONTH
 
‡ SUN: Sunshine hours are calculated approximately and solely from solar radiation readings, but note that the solar sensor's exposure to sunshine is limited. The sensor receives only up to 70% of total possible sunshine exposure this month due to obstruction. There is no allowance for sunshine by visual observation only, so the sunniest day figures above can be very significantly less than the actual daily sunshine duration.
THW = Shaded Heat Index calculated with cooling/warming effect of wind and humidity to give an apparent temperature.
THSW = Unshaded Heat Index calculated with cooling/warming effect of wind, humidity and full direct sunshine to give an apparent temperature.
EVAPO-TRANSPIRATION is drying effect due to sun and wind, and is equivalent to "negative rainfall"

   DAILY STATS MAY 2010
 
TEMPERATURE ºc
HUMIDITY
SUN ‡
PRESSURE
RAINFALL
WIND SPEED
DIRECTION
 WEATHER
 NOTES
DATE
Low
(21-09h)
High
(09-21h)
Temp at 14.00z
RH %
at 14.00z
Dewpoint ºc
at 14.00z
Bright
sun hrs
hPa   †
at 14.00z
Day Total
(mm)
Average
(mph)
Max Gust
(mph)
Dominant
(Compass)
 Precipitation
 type etc ‡
                       
1st
9.6 15.7 14.3 61 6.9 1.0 1008.5 ST 2.0 2.2 12 SW  Rain showers am
2nd
8.3 8.8 6.7 89 5.0 0.0 1010.6 R 10.7 2.1 21 N  Rain
3rd
4.4 11.5 10.4 52 1.0 4.2 1021.0 RS 0.3 4.3 21 N  Rain shower pm
4th
3.2 10.9 10.7 55 2.0 2.2 1024.2 FS 0.0 2.3 17 N  Cloudy
5th
1.8 14.6 13.8 56 5.2 2.0 1017.6 F 0.0 0.6 13 N  Cloudy
6th
7.3 16.7 15.8 44 3.5 7.2 1009.7 FS 0.0 1.2 14 N  Sunny
7th
4.6 14.4 14.3 42 1.6 3.3 1009.4 FS 0.0 1.4 14 N  Sunny intervals
8th
6.2 10.4 9.6 82 6.6 0.0 1010.5 RS 1.0 1.2 11 N  Light rain
9th
6.4 10.3 9.4 72 4.6 0.3 1010.6 FS 0.0 1.0 12 N  Overcast
10th
3.6 15.0 14.4 41 1.3 6.5 1010.7 ST 0.0 1.4 13 N  Sunny pm
11th
2.9 10.4 8.2 61 1.1 0.2 1010.5 ST 0.3 1.1 14 N  Rain shower pm
12th
1.5 13.6 11.2 45 -0.3 2.7 1013.9 ST 0.3 1.0 13 N  Rain shower pm
13th
3.5 13.3 11.3 52 1.8 2.7 1013.3 FS 0.0 1.2 10 SW  Cloudy
14th
2.9 15.4 14.7 36 -0.3 6.2 1010.9 RS 0.0 1.5 13 SW  Sunny spells
15th
5.6 17.2 14.4 47 3.3 2.7 1014.2 ST 0.0 0.8 11 SSW  Cloudy
16th
5.9 14.8 13.5 64 6.8 1.8 1015.9 RS 4.1 2.0 16 SSW  Rain evening
17th
6.7 17.4 15.5 46 3.9 5.3 1023.3 RS 0.0 1.0 13 N  Sunny spells
18th
5.2 20.2 15.4 51 5.3 4.3 1028.0 RS 0.0 0.5 12 SE  Sunny am
19th
5.4 21.2 19.7 46 7.8 4.8 1028.3 ST 0.0 0.9 11 SSW  Sunny am
20th
9.6 22.7 21.5 49 10.3 4.3 1030.5 FS 0.0 0.7 8 N  Sunny intervals
21st
12.1 25.6 25.3 39 10.3 9.3 1029.7 FS 0.0 0.7 13 SW  Sunny
22nd
11.1 23.9 23.4 36 7.5 8.7 1027.6 FS 0.0 0.8 11 N  Sunny
23rd
10.4 28.3 28.1 34 10.8 9.0 1021.5 F 0.0 0.6 8 SE  Sunny
24th
10.9 28.6 28.3 24 5.8 9.0 1011.5 F 0.0 1.3 13 SSW  Sunny
25th
11.3 20.9 20.7 44 8.0 8.2 1010.1 FS 0.0 1.4 16 SW  Sunny
26th
10.6 16.4 15.2 49 4.5 3.5 1008.8 RS 0.0 1.4 16 SW  Cloudy
27th
8.9 15.9 13.1 76 9.0 4.3 1009.0 ST 2.3 0.9 10 SW  Rain am
28th
5.9 19.0 18.7 33 2.1 6.3 1013.9 RS 0.0 2.4 19 SW  Sunny spells
29th
8.3 15.9 12.3 87 10.2 0.8 1008.1 F 3.3 2.8 19 SW  Rain showers
30th
12.5 19.3 18.7 39 4.5 5.7 1009.5 FS 0.0 3.3 20 N  Sunny periods pm
31st
10.1 15.6 13.9 72 8.9 0.1 1019.5 RS 0.0 2.2 13 N  Overcast
                         
‡ SUN: Sunshine hours are calculated approximately and solely from solar radiation readings, but note that the solar sensor's exposure to sunshine is rather limited. The sensor receives less than 25% of total possible sunshine exposure this month, and there is no allowance for sunshine by visual observation only, so the figures above can be very significantly less than the actual daily sunshine duration.
† Barometer trend (previous 3 hours) : F = falling, ST = steady, R = rising; Q = quickly, S = slowly
Weather Notes use METAR codes: OVC = overcast; SHRA = rain showers; '+' = heavy; CAVOK = no cloud below 5000 ft & visibility> 10 km & no fog, precipitation or snow; SN = snow; RASN = Rain and snow