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APRIL 2008 daily and monthly summary

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APRIL 2008
May 2008

1st - 5th
April starts with HP to the SW and LP to the N, bringing mild maritime air after a cloudy and damp start. Warm front on 2nd delivers very little rain but a rather dull day. HP drifts slowly towards the far SW on the 3rd, filling by the 4th. Cold front and troughs sweeps down from N bringing showers on 5th pm and evening.
6th - 13th
On the 6th a very active trough moves down from the N with polar air behind it. Continuous snow falls for 8 hours with a patchy covering of up to 4cm on some surfaces - the coldest April day in my records. From the 7th, LP brings less cold Polar Maritime airstream with sunny periods. Occlusion and trough brings showers pre-dawn of 11th followed by heavy shower with small hail pm. More showers early morning of 12th and downpour during afternoon with thunder. More heavy showers with small hail 13th.
14th - 19th
The unsettled theme continues on the 14th with sunny periods to start before troughs moving down from the north bring more showers during pm. A weak ridge of HP reduces the number of showery downpours before LP tracks towards Biscay on the 16th with HP to the N of Scotland, delivering two gloomy days 18th and 19th.
20th - 27th
Weak ridge of HP extends slowly toward UK from the Azores. Moderate rainfall early morning 21st, and light rain morning of 23rd after fog. Thundery showers with hail on 24th afternoon. HP moves to NW France, then eastwards.
28th - 30th
LP approaches Cornwall. Two spells of rainfall on the 29th, showers in the morning and steady moderate rain with heavier bursts late afternoon. Staying unsettled on 30th as LP moves N across the UK, spell of moderate/heavy rain in the morning and showers later.

MONTHLY SUMMARY
ACTUAL TEMPERATURE
 AVERAGE
 Daily Maximum
13.5
 ºC ( -0.3C )*
 Daily Minimum
4.8
 ºC ( -0.4C )*
 Daily Mean
8.7
 ºC ( -0.1C )*
 EXTREMES
 High Maximum
19.8
 ºC ( 26th )
 Low Minimum
-2.1
 ºC (   8th )
 Low Maximum
3.5
 ºC (   6th )
 High Minimum
11.6
 ºC ( 27th )
 
   
 Days with Air Frost
3
   
 Days with max > 15º
10
   
 Days with max < 5º
1
   
 
PRECIPITATION
 Monthly Total
68.0
 mm ( 128% )
 Days with measurable precip
18
 Days  
   ...of which, days with >= 1.0 mm
12
 Days  
   ...and days with snowfall observed
1
 Days  
 Days with Snow Cover
0.5
 Days  
 Days with Thunder
2
 Days  
 RAIN RATE & EXTREMES
 High Rain Rate
64.3
 mm/hr ( 23rd )
 High Rain Total in 1 day
12.4
 mm ( 29th )
 High Rain Total in 1 hour
5.3
 mm ( 12th, 14.40h)
 EVAPO-TRANSPIRATION
 Total for month
61.3
 mm  
 High Total for 1 day
3.5
 mm ( 26th )
APPARENT TEMPERATURE
 Low Wind Chill
-3.2
 ºC (   6th )
 DAVIS HEAT INDICES THW & THSW
 Low Temp/Hum/Wind Index
-2.2
 ºC (   8th )
 High Temp/Hum/Wind Index
18.6
 ºC ( 26th )
 High Temp/Hum/Sun/Wind Index
27.4
 ºC (   4th )
 
DEWPOINT & HUMIDITY
 High Dewpoint
10.4
 ºC ( 27th )
 Low Dewpoint
-6.6
 ºC (   8th )
 Average Dewpoint at 14h
3.8
 ºC  
 Low Relative Humidity
29
 % (   8th )
 Average RH at 14h
58
 %  
WIND SPEED & DIRECTION
 Monthly Average
2.0
 mph  
 Windiest day (Average)
4.7
 mph ( 12th )
 Highest Gust
22
 mph ( 11 & 12th )
 Dominant Direction
SSW
 ( 32% )
 
BAROMETER
 Monthly Mean
1009.5
 hPa  
 High Barometer
1030.2
 hPa (  3rd  )
 Low Barometer
984.5
 hPa ( 30th )
SUNSHINE
 Max Sensor Exposure to direct sun
9
 hours/day (13+ possible)
 Calculated Monthly Sunshine Hours
123.5
 hours  
 Estimated Actual Hours (approx)
140
 hours  
 Sunniest Day Measured
8.7
 hours ( 22nd )
 Days with no sunshine
3
 Days  
 
FOG
 Number of Days with Fog
1
 Days  
NEW RECORDS SET THIS MONTH
  • Coldest April day (6th)
‡ 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 APRIL 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
4.6 15.7 15.4 42 2.6 7.0 1017.8 rs 0.3 3.9 21 W
2nd
7.8 13.8 13.3 70 8.0 0.7 1024.1 st 0.3 2.0 17 SSW
3rd
9.2 16.9 16.4 49 5.6 4.0 1028.9 st 0.0 1.9 12 N
4th
5.7 19.2 18.8 42 5.6 6.3 1023.9 f 0.0 1.3 12 W
5th
6.6 11.4 9.2 59 1.6 0.8 1012.2 f 1.5 2.9 19 N
6th
0.4 3.5 0.5 88 -1.4 0.0 1003.5 f 5.6 1.0 14 N
7th
-0.3 8.5 8.5 53 -0.5 5.7 1002.8 rs 0.0 1.8 14 SSW
8th
-2.1 11.3 9.2 36 -5.1 6.2 1002.4 fs 0.3 1.1 12 SSW
9th
-1.1 13.3 13.1 36 -1.6 5.2 997.3 fs 0.0 0.6 8 ESE
10th
0.2 13.1 11.6 45 0.1 3.2 997.4 fs 0.0 1.1 12 SSW
11th
1.0 12.3 9.6 78 5.9 6.5 996.0 rs 3.3 3.3 22 SSW
12th
5.1 12.8 7.0 84 4.5 4.7 1004.7 rs 10.9 4.7 22 SSW
13th
2.5 12.0 10.6 79 7.1 4.2 1007.7 st 5.8 1.2 16 SSW
14th
4.9 13.6 13.3 44 1.3 3.5 1016.5 st 2.5 2.2 16 N
15th
1.7 13.5 12.2 32 -4.1 7.2 1022.4 fs 0.3 1.4 13 N
16th
4.7 11.8 10.0 48 -0.5 2.8 1018.0 f 0.8 0.7 11 ESE
17th
1.9 10.9 10.2 44 -1.5 7.8 1005.3 f 0.0 2.0 20 SW
18th
5.7 9.1 8.8 72 4.0 0.0 995.4 fs 0.0 2.1 17 ENE
19th
6.6 8.9 8.6 80 5.4 0.0 997.9 rs 3.3 1.3 11 ENE
20th
8.0 15.4 15.2 65 8.7 5.2 1001.2 fs 0.0 0.9 13 SE
21st
8.5 12.1 10.7 74 6.2 1.3 1002.8 rs 6.3 1.8 16 N
22nd
5.8 18.7 18.6 45 6.4 8.7 1009.5 rs 0.0 0.8 12 N
23rd
4.3 18.1 14.6 70 9.1 4.8 1016.7 rs 1.5 0.9 11 SSW
24th
6.4 14.8 14.2 62 7.0 4.3 1018.5 fs 5.3 3.1 19 SSW
25th
7.9 16.6 15.3 61 7.8 4.5 1027.1 fs 0.0 2.5 14 SSW
26th
7.5 19.8 19.1 43 6.2 6.7 1023.0 fs 0.0 1.9 19 SSW
27th
11.6 18.5 17.8 59 9.7 1.8 1011.1 f 0.3 1.5 14 SSW
28th
8.9 15.2 13.9 53 4.5 6.5 1002.9 fs 0.0 3.8 20 SSW
29th
5.3 13.7 13.6 54 4.5 2.2 993.8 f 12.4 2.0 20 SW
30th
5.1 11.0 9.3 78 5.6 1.7 989.9 r 7.6 3.6 21 SSW
                       
‡ 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