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MAY 2008 daily and monthly summary

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MAY 2008
June 2008
1st - 14th
LP over C Scotland on the 1st, shower with hail and thunder. The LP moves W again with HP building over Germany, one light rain shower on 2nd. LP drifts W to SE of Greenland with ridges of HP from the N & S over NW Europe. Long periods of sunshine and clear skies if sometimes rather hazy from 3rd to 8th. HP rather "flabby" to our E but well established importing a warm and dry contintental airflow. Little change in the pattern as the warm and dry spell continues but with a fresher breeze on 13th and 14th.
15th - 17th
LP in Biscay and Brittany ends the fine spell bringing low, dull overcast and showers on 15th pm. A dismal three days with intermittent rain most of the day on the 17th
18th - 24th
A weak ridge of HP extends southwards from the Greenland Sea area of the Arctic Ocean with LP to SSW of Iceland. Situation remains similar with winds gradually veering to import slightly warmer air and some long sunny spells though tending to be cloudy by the middle of the day.
25th - 31st
Blocking HP remains to N and slow moving LP approaches Brittany and Channel Islands. Moderate / Heavy rain from midnight to 6am on 25th but dry for the rest of the day. More prolonged heavy rain early morning of 26th with further outbreaks during the day, a very gloomy day. The LP meanders slowly northward, showers before dawn and after sunset on 27th. Thunderstorm pre-dawn of 28th. Frontal rain from the SSE during the afternoon of 29th after a fine start. UK is surrounded by slack LPs, 30th and 31st are mostly cloudy but bright.

MONTHLY SUMMARY
ACTUAL TEMPERATURE
 AVERAGE
 Daily Maximum
20.4
  ºC ( +3.0 )*
 Daily Minimum
9.8
  ºC ( +1.4 )*
 Daily Mean
14.5
  ºC ( +2.0 )*
 EXTREMES
 High Maximum
27.8
  ºC ( 10th )
 Low Minimum
4.2
  ºC ( 2nd )
 Low Maximum
11.2
  ºC ( 17th )
 High Minimum
13.8
  ºC ( 28th )
 
   
 Days with max =>25°
6
    
 Days with max => 20°
19
    
 Days with min <= 5º
5
  ( 0 air frosts )
 
PRECIPITATION
 Monthly Total
72.4
  mm ( 158% )*
 Days with measurable precip
11
  Days  
   ...of which, days with >= 1.0 mm
9
  Days  
   ...and days with hail observed
0
  Days  
 Days with thunder
1
  Days  
 
 
    
 RAIN RATE & EXTREMES
 High Rain Rate
55.9
  mm/hr ( 25th )
 High Rain Total in 1 day
23.9
  mm ( 26th )
 High Rain Total in 1 hour
9.1
  mm ( 28th, 02.00)
 EVAPO-TRANSPIRATION
 Total for month
91.1
  mm  
 High Total for 1 day
4.7
  mm ( 8th )
APPARENT TEMPERATURE
 Low Wind Chill
4.0
  ºC ( 20th )
 DAVIS HEAT INDICES THW & THSW
 Low Temp/Hum/Wind Index
4.0
  ºC ( 20th )
 High Temp/Hum/Wind Index
26.7
  ºC ( 9 & 10th )
 High Temp/Hum/Sun/Wind Index
33.2
  ºC (   9th )
 
DEWPOINT & HUMIDITY
 High Dewpoint
14.2
  ºC ( 10th )
 Low Dewpoint
0.9
  ºC ( 22nd )
 Average Dewpoint at 14h
7.6
  ºC  
 Low Relative Humidity
22
  % ( 11th )
 Average RH at 14h
50
  %  
WIND SPEED & DIRECTION
 Monthly Average
1.2
  mph  
 Windiest day (Average)
4.1
  mph (   1st )
 Highest Gust
27
  mph ( 24th )
 Dominant Direction
N
  ( 17% )
 
BAROMETER
 Monthly Mean
1013.8
  hPa  
 High Barometer
1024.3
  hPa ( 5th )
 Low Barometer
998.3
  hPa ( 1st )
SUNSHINE
 Max Sensor Exposure to direct sun
10
  hours/day (15 possible)
 Calculated Monthly Sunshine Hours
161.6
  hours  
 Estimated Actual Hours (approx)
190.0
  hours  
 Sunniest Day Measured
9.0
  hours ( 13th )
 Days with no sunshine
3
  Days  
 
FOG
 Number of Days with Fog
0
  Days  
NEW RECORDS SET THIS MONTH
  • Warmest first half of any May
* deviation from average 1984 - 2007
‡ 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 2008
 
TEMPERATURE ºc
HUMIDITY
SUN ‡
PRESSURE
RAINFALL
WIND SPEED
DIRECTION
DATE
Minimum
(21-09h)
Maximum
(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)
High Gust
(mph)
Dominant
(Compass)
                     
1st
 6.9 15.1 14.9 49 4.3 8.0 1007.7 r 0.3 4.1 22 SSW
2nd
 4.2 17.1 17.1 46 5.3 7.0 1020.7 rs 0.3 1.4 13 SSW
3rd
 4.7 20.9 20.2 42 6.9 7.2 1022.1 fs 0.0 1.2 16 ESE
4th
 10.8 24.3 22.3 39 7.6 4.2 1020.4 st 0.0 0.7 13 SE
5th
 13.5 23.1 22.3 40 8.0 7.1 1023.7 st 0.0 0.7 12 SW
6th
 9.6 24.4 24.3 33 7.0 8.7 1021.7 fs 0.0 0.9 13 SW
7th
 11.3 27.4 27.2 27 6.5 8.7 1017.4 fs 0.0 0.9 14 ESE
8th
 11.4 26.3 25.9 27 5.5 8.7 1012.1 fs 0.0 1.3 22 ESE
9th
 13.0 27.3 26.8 32 8.7 6.7 1010.9 st 0.0 0.8 14 ESE
10th
 12.9 27.8 26.7 38 11.2 7.7 1015.6 st 0.0 0.4 8 WNW
11th
 11.1 27.3 26.6 29 7.1 8.8 1017.6 st 0.0 0.8 14 NNW
12th
 10.3 25.8 25.6 27 5.2 8.8 1016.8 st 0.0 1.0 14 SW
13th
 11.1 22.7 22.5 28 3.1 9.0 1015.6 fs 0.0 2.1 17 N
14th
 10.8 22.0 21.6 43 8.5 8.5 1012.0 f 0.0 2.2 17 N
15th
 9.8 13.4 13.4 87 11.3 0.0 1008.9 st 2.5 1.0 11 N
16th
 9.9 14.9 9.9 74 9.4 0.2 1007.6 fs 0.0 0.7 7 N
17th
 9.9 11.2 10.9 89 9.1 0.0 1007.1 rs 4.3 0.8 10 N
18th
 7.3 16.2 16.0 41 2.7 6.5 1013.2 st 3.8 1.7 14 N
19th
 4.8 15.6 15.2 42 2.3 4.8 1016.7 st 0.0 1.2 13 N
20th
 4.1 16.9 16.3 40 2.7 4.3 1017.8 fs 0.0 0.9 11 SW
21st
 4.7 21.2 21.1 34 4.6 8.0 1014.8 fs 0.0 1.0 17 SE
22nd
 7.4 21.4 19.5 33 2.8 5.3 1013.1 fs 0.0 0.7 11 SE
23rd
 11.3 23.1 21.8 31 3.9 5.3 1010.9 fs 0.0 0.7 12 ESE
24th
 12.3 21.4 20.6 49 9.5 7.7 1008.1 fs 1.5 2.3 27 NE
25th
 12.4 20.9 18.9 61 11.3 3.8 1010.2 rs 15.5 1.2 11 N
26th
 11.9 12.6 12.5 91 11.1 0.0 1008.6 rs 23.9 2.3 17 ENE
27th
 10.2 17.8 17.2 71 11.9 0.8 1009.5 fs 1.8 0.5 8 N
28th
 13.8 15.3 14.3 88 12.3 0.7 1003.4 rs 14.2 2.5 24 SSW
29th
 8.7 20.3 14.8 81 11.5 1.7 1012.8 rs 4.3 0.4 8 SW
30th
 11.8 17.9 17.5 68 11.5 0.7 1012.6 rs 0.0 0.8 10 N
31st
 10.9 21.9 19.4 63 12.2 2.7 1015.5 st 0.0 0.6 11 NNW
                       
‡ 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 approx 65% 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