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APRIL 2006 daily and monthly summary

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APRIL 2006
May 2006


Note A total hosepipe and sprinkler ban is in effect in South East Water & Mid Kent Water supply areas until further notice.
1st - 8th Low pressure moves away to the E, and an anticyclone builds slowly to the NW. Some heavy overnight showers and rain, but mostly bright or sunny during the daytime. Heavy hail shower afternoon of the 4th left the ground covered. Becoming more settled with long sunny spells.
9th - 11th Low pressure moves into the North Sea dragging Polar Maritime air down from the Arctic behind a cold front. Prolonged rainfall on the night of the 9th/10th ( most precipitation in 24h here since Dec 2003) turned to snow and gave a minor covering here of 3cm before dawn, but 10 - 15cm on the higher ground of Tunbridge Wells. Staying cool and generally dull. Moderate rain, late afternoon 11th as the Atlantic maritime influence returns.
12th - 20th Turning mild and mostly dry but remaining dull as a series of slow moving fronts with little rain straddle longitudinally from Scandinavia to the middle Atlantic, lying across the southern UK . In general a rather dull, unsettled Easter weekend, followed by drier and brighter conditions.
21st - 25th The UK lies in a col with LP north and south and HP east and west. Marked temperature difference between north eastern and southern England on the 21st. Low pressure stands over the SE on the 23rd and two cold fronts sweep down from the NW, ending the short warm spell. Remaining fairly calm and turning dull with fog on the mornings of the 24th and 25th.
26th - 30th A mostly cloudy but dry end to the month with no significant weather, although feeling rather fresh with N winds dominating. The highest daily temperature for the year by the end of April failed to reach 20ºC for the first time since 2001.

 APRIL 2006 - MONTHLY SUMMARY
 TEMPERATURE
 Average Maximum 13.7
ºc 
 (+0.1)*
 Average Minimum 5.7
ºc 
 (+0.6)*
 Monthly Mean 9.2
ºc 
 
 Highest Maximum 19.7
ºc 
 (21st)
 Lowest Minimum -0.7
ºc 
 (11th)
 Days with Min <=0ºc 2
 
   
 
 AMBIENT TEMPERATURE
 Low Wind Chill -0.6
ºc 
 (6th)
 Low Heat Index (THW) -0.8
ºc 
 (11th)
 High Heat Index (THW) 18.4
ºc 
 (21st)
 High Sun Index (THSW) 24.9
ºc 
 (14th)
    
 
 RAINFALL
 Monthly Total 61.5
 mm
 (112%)*
 Rainy Days (=>0.2mm) 15
 (+2)*
 Inc days =>1mm) 9
 
 Dry Days 15
 (-2)*
 Highest Daily Total 15.7
 mm
 (10th)
 Highest Rain Rate 22.1
 mm/hr
 (1st)
   
 EVAPO-TRANSPIRATION
 Highest Daily 2.93
 mm (8th)
 Monthly Total 51.15
 mm
 WIND
 Monthly Average 2.1  mph  
 Highest Gust 28  mph (13th)
 Dominant Directions SSW  (40%)
N  (14%)
W  (11%)
NNW  (11%)
     
 SUNSHINE†
 Sunniest Day
7.2
 hrs (6th)
 Monthly Sunshine
77.8
 Hours
 Peak Solar Rad.
1087
 w/m² (29th)
 Total Solar Energy
7153
 Langleys
 
   
 DEWPOINT
 Average at 14.00h 3.8 ºc
 Highest Reading 10.7 ºc   (23rd)
 Lowest Reading -8.5 ºc   (6th)
 RELATIVE HUMIDITY
 Average at 14.00h 57 %
 Lowest Reading 23 % (6th)
 Monthly Average 71 %
 BAROMETER
 Monthly Mean 1014.5  hPa  
 Highest Reading 1026.1  hPa (27th)
 Lowest Reading 1002.2  hPa (15th)
* = deviation from 20 year average. The monthly mean is calculated from all logged temperatures and is not the simple mean of the daily minimum and maximum.
Sunshine Hours are approximate only and calculated from the sensor's limited exposure to direct sun, no allowance for visual only observation. As the sensor receives less than 60% of total possible sunshine exposure this month, the figures above can be very significantly less than the actual 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 2006
 
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
9.7 14.4 49 3.2 6.3 1006.9 rs 1.8 5.8 27 SSW
2nd
6.1 12.6 68 6.2 2.7 1005.8 st 12.4 4.6 26 SSW
3rd
6.6 13.2 50 1.7 3.0 1019.3 rs 0.0 1.9 12 SSW
4th
2.0 9.7 55 -0.7 2.3 1020.0 fs 2.0 1.2 14 NNW
5th
0.4 11.3 43 -1.8 6.2 1016.4 fs 0.0 1.7 21 N
6th
-0.4 12.9 27 -6.4 7.2 1013.9 f  0.0 2.6 20 SSW
7th
4.3 11.9 55 2.3 1.7 1012.6 f  0.8 3.1 21 SSW
8th
6.2 12.4 37 -3.4 6.7 1007.3 st 0.5 3.9 19 SSW
9th
2.8 12.9 52 -0.5 1.0 1013.6 st 15.2 1.6 14 SSW
10th
0.3 10.4 56 0.6 2.7 1021.8 st 15.7 1.1 12 NNW
11th
-0.7 8.0 63 1.1 0.0 1015.3 f  4.1 3.6 24 SSW
12th
4.5 14.3 50 3.1 3.0 1014.3 st 0.3 2.5 16 SSW
13th
8.9 14.9 63 7.8 0.0 1008.6 fs 0.0 4.3 28 SSW
14th
7.9 15.1 85 8.8 2.0 1012.7 st 1.0 1.6 13 SSW
15th
7.8 14.4 72 8.7 0.0 1004.3 f  4.1 0.5 8 ESE
16th
7.9 15.6 62 7.5 1.0 1011.5 rs 0.3 1.2 10 SSW
17th
6.7 15.4 45 2.6 3.2 1013.1 fs 0.0 1.5 16 SSW
18th
5.5 15.3 44 2.4 5.7 1013.7 st 0.0 2.9 16 SSW
19th
8.1 13.3 59 5.4 1.8 1012.5 fs 0.0 3.6 18 SSW
20th
9.0 12.9 83 8.9 0.2 1012.5 st 0.5 2.4 12 SSW
21st
7.6 19.7 41 6.1 3.2 1015.6 st 0.0 0.4 8 NNW
22nd
6.6 17.8 52 5.3 7.0 1019.8 f  0.0 0.9 11 SE
23rd
6.3 13.1 83 9.5 0.0 1016.0 st 2.5 0.0 5 SE
24th
8.6 13.5 77 9.0 0.2 1016.7 fs 0.0 0.4 8 WNW
25th
7.0 12.6 84 9.1 0.2 1017.1 st 0.0 2.0 17 SSW
26th
8.3 16.5 53 5.6 1.5 1019.7 st 0.0 1.1 12 N
27th
8.4 15.7 53 4.9 0.5 1024.7 st 0.0 0.9 13 N
28th
4.8 14.2 54 4.1 4.5 1024.7 fs 0.0 2.1 19 N
29th
5.2 12.3 46 0.2 1.8 1020.2 f  0.0 1.5 14 N
30th
5.2 14.3 39 0.3 2.2 1010.4 fs 0.8 1.3 11 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 only 45-55% 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: f = falling, st = steady, r = rising; q = quickly, s = slowly

'WIND ROSE' PLOT FOR THE MONTH
Feb 2006 Wind rose
The 'petals' represent wind direction and the length represents frequency, i.e. in this case winds from the SSW were the most common, followed by the N then W and NNW.

The colours represent the strength of the wind, with black being weakest through blue then lighter colours (cyan, light green, yellow, magenta, red) being stronger.

This data excludes 'calm' readings.