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APRIL 2007 daily and monthly summary

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APRIL 2007
May 2007

1st - 8th
HP over western UK. Hazy sunshine 1st and 2nd, trailing end of a weak cold front brings a cloudy and cool day on the 3rd. Brighter but still a notable wind chill on the 4th. Much warmer with near unbroken sunshine on 5th through the 7th. More cloud around on the 8th as the HP slips westward and weakens.
9th - 15th
HP starts to drift eastward. More cloudy from the 9th to 12th with mist lasting until midday on the 13th. Notably warm on the weekend 14th/15th with near unbroken hazy sunshine. The 15th became the warmest April day at this site since recording began in 1984.
24th - 31st
HP still dominant over N Europe. Thundery showers overnight on 26th brings a series of 25 rainless days to an end, with further light rain from a warm front crossing the channel from east to west. By the 28th HP lies to the NE of the UK.
 APRIL 2007 - MONTHLY SUMMARY
 TEMPERATURE
 Average Maximum 19.0
ºc 
  ( +5.4 )
 Average Minimum 6.8
ºc 
  ( +1.6 )
 Monthly Mean 12.3
ºc 
  
 Highest Maximum 26.2
ºc 
  (15th)
 Lowest Minimum 0.7
ºc 
  (  5th)
 Days Min <= 0 ºC 0
 
 Days Max > 20 ºC 9
 
   
 
 AMBIENT TEMPERATURE
 Low Wind Chill 0.7
ºc 
  (  5th)
 Low Heat Index (THW) 0.6
ºc 
  (  5th)
 High Heat Index (THW) 25.2
ºc 
  (15th)
 High Sun Index (THSW) 32.7
ºc 
  (15th)
    
 
 RAINFALL
 Monthly Total 5.3
 mm
 (10%)
 Rainy Days (=>0.2mm) 1
(-12)
 Inc days =>1mm 1
 
 Dry Days 29
(+12)
 Highest Daily Total 5.3
 mm
  (26th)
 Highest Rain Rate 15.7
 mm/hr
  (26th)
 Days with thunder 1
 
   
 EVAPO-TRANSPIRATION
 Highest Daily 3.43
 mm (30th)
 Monthly Total 75.3
 mm
 WIND
 Monthly Average 0.7  mph  
 Highest Gust 18  mph (4th)
 Dominant Directions NNW  (22%)
N  (21%)
SSW  (17%)
SE  (  6%)
   
     
 SUNSHINE†
 Sunniest Day 10.1  hrs (30th)
 Monthly Sunshine 200.0  Hours
 Peak Solar Rad. 1075  w/m² (10th)
 Total Solar Energy 10881  Langleys
 
   
 DEWPOINT
 Average at 14.00h 6.0 ºc
 Highest Reading 11.9 ºc (16th)
 Lowest Reading -2.1 ºc (  7th)
 RELATIVE HUMIDITY
 Average at 14.00h 46 %
 Lowest Reading 25 % (19th)
 Monthly Average 65 %
 BAROMETER
 Monthly Mean 1021.4  hPa  
 Highest Reading 1028.1  hPa  (10th)
 Lowest Reading 1011.0  hPa  (25th)
   DAILY STATS APRIL 2007
 
TEMPERATURE ºc
HUMIDITY
SUN ‡
PRESSURE
RAINFALL
WIND SPEED
DIRECTION
DATE
Minimum
(21-09h)
Maximum
(09-21h)
RH %
at 14.00
Dewpoint ºc
at 14.00
Bright
sun hrs
hPa   †
at 14.00
Day Total
(mm)
Average
(mph)
High Gust
(mph)
Dominant
(Compass)
                   
1st
 6.7 15.1 47 3.6 8.5 1025.4 st 0.0 1.5 15 NNW
2nd
 5.5 17.1 38 2.2 8.3 1026.2 f 0.0 0.8 12 WSW
3rd
 4.9 10.1 60 1.8 0.6 1022.9 fs 0.0 2.0 17 N
4th
 2.7 12.1 49 1.5 6.0 1023.2 fs 0.0 1.4 18 NNW
5th
 0.7 19.7 43 5.9 8.5 1022.5 fs 0.0 0.1 6 NNW
6th
 2.7 19.3 39 4.9 8.6 1022.8 fs 0.0 0.6 11 NNW
7th
 2.8 17.1 29 -1.2 8.7 1026.9 st 0.0 0.3 10 NNW
8th
 1.5 17.8 32 0.4 9.0 1023.7 f 0.0 0.6 12 SSW
9th
 5.0 17.9 39 3.7 5.6 1018.7 fs 0.0 0.6 13 SSW
10th
 11.3 18.8 47 5.7 4.3 1022.2 fs 0.0 0.4 10 SSW
11th
 10.0 19.4 46 6.5 4.5 1023.0 fs 0.0 0.1 10 ESE
12th
 6.3 18.8 50 7.7 8.7 1020.4 fs 0.0 0.4 11 NNW
13th
 7.8 20.3 53 10.1 5.8 1018.9 f 0.0 0.2 8 NNW
14th
 8.2 23.8 46 11.3 8.7 1021.3 fs 0.0 0.2 10 NNW
15th
 7.9 26.2 31 6.8 9.0 1020.8 fs 0.0 0.1 10 N
16th
 10.3 23.7 45 10.9 8.5 1022.8 fs 0.0 0.7 12 NNW
17th
 9.9 18.4 51 6.7 5.8 1023.5 fs 0.0 0.4 11 N
18th
 6.5 17.9 36 1.4 8.2 1024.2 fs 0.0 0.6 12 N
19th
 2.8 21.1 35 4.0 8.7 1017.7 f 0.0 0.6 14 N
20th
 8.4 17.3 49 5.2 5.5 1022.0 fs 0.0 0.3 11 ESE
21st
 3.7 19.4 34 2.1 8.3 1020.5 fs 0.0 0.4 11 SE
22nd
 4.4 22.9 36 7.0 7.2 1018.4 fs 0.0 0.7 16 SSW
23rd
 9.1 16.8 73 10.9 1.5 1019.2 st 0.0 1.1 13 SSW
24th
 10.9 21.8 50 9.5 7.5 1016.2 fs 0.0 0.6 13 SSW
25th
 11.5 18.0 70 9.8 2.7 1014.4 rs 0.0 1.0 17 SSW
26th
 9.9 16.8 73 11.1 0.7 1019.6 st 5.3 1.0 13 SSW
27th
 8.9 20.3 58 11.6 6.5 1021.8 fs 0.0 1.0 11 N
28th
 8.7 21.6 30 3.3 8.2 1021.4 fs 0.0 0.9 12 N
29th
 8.8 19.9 57 10.8 5.8 1017.2 f 0.0 0.7 11 NNW
30th
 8.9 19.3 43 5.1 10.1 1013.1 st 0.0 1.1 13 ENE
                     
‡ 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 75% 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