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APRIL 2010 daily and monthly summary

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APRIL 2010
May
1st - 7th
1st, LP 986 hPa off NE Scotland, mainly sunny. 2nd LP 987 hPa W of Ireland, LP 992 hPa N of Scotland, HP 1023 hPa Spain, cold front passes early pm with 2 hours light/moderate rain. 3rd, mainly cloudy with sunny intervals, rain after 21.30h to 02.00 following morning. 4th, LP 1006 hPa Netherlands coast, LPs to far W, HP 1030 hPa W of Portugal, light rain showers early am sunny intervals later. 5th, mainly cloudy with sunny intervals. 6th, a sunny day but with extensive thin high cloud. 7th, cloudy with cold front passing pm bringing light rain.
8th - 15th
8th, HP 1034 hPa near Isles of Scilly, almost unbroken sunshine. 9th, sunny but cloudier mid-afternoon onwards. 10th and 11th, sunny. 12th cloudy am, sunnier pm. 13th, HP 1036 hPa N Atlantic, LP 1002 hPa Madeira, mainly sunny. 14th, weak front moves E to W, cloudy and dull am, brighter later with cloud clearing late pm. 15th, another sunny day, high altitude diffuse volcanic ash from Eyjafjallajökull in Iceland covers much of the UK skies but is not visible.
16th - 24th
16th, HP still dominates, 1024/1026 hPa Southern England, fog am clearing 09.00 for a sunny day with volcanic ash cloud faintly visible. 17th - 19th, sunny but again with a visible haze. 20th - 23rd, less haze, some cloud but still long sunny periods. 24th, hazy sunshine and very low humidity.
25th - 30th
25th, HPs to S and E, LPs to W, after 17 days without rainfall, light rain showers am from passage of cold fronts. 26th, mainly cloudy with sunny intervals pm. 27th, sunny am and late pm, cloudier middle of day. 28th, long sunny periods. 29th, sunny am with rain showers pm and early night. 30th, LP 994 hPa northern Norway and HP over Mediterranean Sea, light rain early am from passage of fronts.

APRIL 2010 MONTHLY SUMMARY
ACTUAL TEMPERATURE
 AVERAGE
 Daily Maximum
15.7
  ºC ( +1.8 )*
 Daily Minimum
4.8
  ºC ( -0.5C )*
 Daily Mean
9.82
  ºC ( c. +0.8C )
 EXTREMES
 High Maximum
21.4
  ºC ( 24 & 28th  )
 Low Minimum
0.9
  ºC ( 22nd )
 Low Maximum
9.6
  ºC (   2nd )
 High Minimum
8.8
  ºC ( 25th )
 
   
 Days with max => 20 °C
4
   ( +2 )*
 Days with max <10 °C
2
   ( -2 )*
 Days with air frost
0
   ( ±0 )*
 
PRECIPITATION
 Monthly Total
15.7
  mm ( 30% )*
 Days with measurable precip
7
  Days ( -6 )*
   ...of which, days with >= 1.0 mm
5
  Days ( -5 )*
   ...and days with snowfall observed
0
  Days  
 Days with Snow Cover
0
  Days  
 Days with Thunder
0
  Days  
 RAIN RATE & EXTREMES
 High Rain Rate
5.8
  mm/hr ( 2nd )
 High Rain Total in 1 day
6.7
  mm ( 2nd )
 High Rain Total in 1 hour
3.6
  mm (2nd , 13.40h)
 EVAPO-TRANSPIRATION
 Total for month
78.3
  mm  
 High Total for 1 day
3.7
  mm ( 24th )
APPARENT TEMPERATURE
 Low Wind Chill
-2.3
  ºC (   1st )
 DAVIS HEAT INDICES THW & THSW
 Low Temp/Hum/Wind Index
-0.9
  ºC (   1st )
 High Temp/Hum/Wind Index
20.0
  ºC ( 28th )
 High Temp/Hum/Sun/Wind Index
26.9
  ºC ( 28th )
 
DEWPOINT & HUMIDITY
 High Dewpoint
11.4
  ºC ( 25th )
 Low Dewpoint
-6.1
  ºC ( 24th)
 Average Dewpoint at 14h
3.3
  ºC  
 Low Relative Humidity
17
  % ( 24th )
 Average RH at 14h
48
  %  
WIND SPEED & DIRECTION
 Monthly Average
1.6
  mph  
 Windiest day (Average)
4.1
  mph ( 1st )
 Highest Gust
28
  mph ( 2nd )
 Dominant Direction
SW
  ( 26% )
 
BAROMETER
 Monthly Mean
1018.3
  hPa  
 High Barometer
1033.2
  hPa ( 10th )
 Low Barometer
998.1
  hPa (   3rd )
SUNSHINE
 Max Sensor Exposure to direct sun
9-10
  hours/day (13-14 possible)
 Calculated Monthly Sunshine Hours
180.6
  hours  
 Estimated Actual Hours (approx)
205.0
  hours  
 Sunniest Day Measured
8.8
  hours ( 23rd )
 Days with no sunshine
1
  Day  
 
FOG
 Number of Days with Fog
2
  Days  
‡ SUN: Sunshine hours are calculated approximately and solely from solar radiation readings, but note that the solar sensor's exposure to sunshine in Midwinter is very limited. The sensor receives only up to 75% 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 APRIL 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
 1.3 9.8 9.4 52 0.0 6.8 1009.2 RS 0.0 4.1 19 SW  Sunny periods
2nd
 5.1 9.6 8.2 88 6.3 2.8 1000.5 F 6.7 3.4 28 SW  Rain pm
3rd
 5.6 12.7 11.6 54 2.6 4.7 999.6 FS 3.0 2.8 21 SW  Rain night
4th
 5.6 11.3 9.9 53 0.7 3.8 1012.7 R 1.6 2.0 18 N  Rain showers am
5th
 2.9 12.6 12.5 61 5.2 3.7 1021.9 FS 0.0 3.0 20 SW  Sunny intervals
6th
 6.1 15.5 15.0 44 2.8 6.8 1013.6 F 0.0 2.2 21 SE  Sunny
7th
 6.5 12.7 10.6 81 7.4 0.0 1017.1 R 1.8 1.2 12 N  Rain pm
8th
 4.4 16.7 16.1 36 1.0 8.5 1029.5 ST 0.0 1.1 11 N  Sunny
9th
 3.3 19.3 17.4 38 2.9 5.3 1031.8 FS 0.0 0.4 10 N  Sunny periods
10th
 5.9 17.2 16.6 41 3.2 8.3 1031.4 FS 0.0 0.7 11 SW  Sunny
11th
 5.5 13.7 12.3 45 0.7 7.5 1026.8 FS 0.0 2.1 16 NE  Sunny
12th
 6.0 14.5 13.5 51 3.6 5.8 1023.9 FS 0.0 2.5 16 N  Sunny periods
13th
 4.8 16.1 15.8 39 1.8 7.3 1021.3 FS 0.0 2.1 17 N  Sunny
14th
 6.2 10.6 9.4 64 2.9 3.0 1019.9 ST 0.0 1.4 13 N  Sunny pm
15th
 4.2 15.1 13.9 50 3.6 7.3 1021.6 ST 0.0 1.4 13 N  Sunny
16th
 4.7 13.7 13.3 53 3.9 5.5 1026.1 FS 0.0 1.4 14 N  Sunny pm
17th
 1.9 17.8 17.2 36 2.0 8.7 1019.4 F 0.0 0.4 8 N  Sunny
18th
 1.5 18.6 17.4 31 0.1 8.7 1013.0 FS 0.0 0.4 11 N  Sunny
19th
 5.6 17.4 16.4 46 4.7 7.3 1015.4 FS 0.0 0.9 11 SE  Sunny periods
20th
 5.2 14.4 13.7 37 -0.7 8.7 1017.3 ST 0.0 1.7 17 N  Sunny
21st
 3.1 14.4 13.0 35 -2.1 8.0 1019.0 FS 0.0 1.1 13 N  Sunny
22nd
 0.9 14.6 14.5 32 -2.0 8.5 1016.4 F 0.0 0.6 13 SE  Sunny
23rd
 1.1 18.4 17.7 33 1.2 8.8 1015.1 FS 0.0 0.5 11 SE  Sunny
24th
 2.6 21.4 20.9 24 -0.4 8.3 1017.1 FS 0.0 0.8 12 SE  Sunny
25th
 8.8 17.4 16.5 61 8.9 4.3 1019.4 RS 0.8 2.2 19 SW  Rain showers am
26th
 6.9 17.2 15.7 62 8.5 2.8 1024.7 ST 0.0 1.3 11 SSW  Cloudy
27th
 6.2 20.1 19.3 46 7.4 5.8 1026.2 FS 0.0 1.0 13 SW  Sunny am
28th
 6.4 21.4 20.2 37 5.0 6.2 1018.7 FS 0.0 1.2 14 SW  Sunny periods
29th
 7.8 20.8 19.9 39 5.5 2.7 1008.2 F 0.8 1.0 11 N  Rain showers pm
30th
 8.0 15.3 13.7 64 7.0 4.7 1009.6 ST 1.0 3.8 20 SW  Rain showers am
                         
‡ 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