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March 2007 daily and monthly summary

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MARCH 2007
April 2007

1st - 7th
Overnight rain showers on 1st becoming bright and breezy by morning, setting the pattern for the next few days. Thundery shower early evening of the 3rd. The wettest start to March since 2001 here, but with most of the rain still falling at night, also long sunny spells.
8th - 9th
A ridge of HP from E of the Azores brings more sunny periods as showers continue to be confined to night time. The mildest start to a March since 2000
10th - 17th
Still under HP, dry and mostly sunny, rather mild for mid March.
18th - 24th
A rapidly deepening LP to the N of the UK brings stormy winds and wintry showers to the far N. It introduces a mass of colder air moving SEwards from Greenland. Some moderate wintry showers with sleet and hail 19th & 20th and a noticeable wind chill. Becoming more dull with drizzle on the 23rd & 24th.
25th - 31st
HP established to the ENE but slipping away to E. Brighter - much hazy sunshine from 26th - and warmer but with fog and mist mornings of 26th and 27th. Becoming unsettled with LP over N France, very dull with intermittent rain and drizzle during daytime 30th. A fine end to the month with hazy sunshine after morning mist cleared.
 MARCH 2007 - MONTHLY SUMMARY
 TEMPERATURE
 Average Maximum 12.1
ºc 
 ( +1.4 )*
 Average Minimum 4.0
ºc 
 ( +0.1 )*
 Monthly Mean 7.6
ºc 
  
 Highest Maximum 18.6
ºc 
  (27th)
 Lowest Minimum -2.2
ºc 
  (22nd)
 Days Min<= 0 ºC 2
 
 Days Max < 5 ºC 0
 
   
 
 AMBIENT TEMPERATURE
 Low Wind Chill -2.7
ºc 
  (21st)
 Low Heat Index (THW) -2.8
ºc 
  (21st)
 High Heat Index (THW) 17.3
ºc 
  (27th)
 High Sun Index (THSW) 26.9
ºc 
  (27th)
    
 
 RAINFALL
 Monthly Total 45.6
 mm
 ( 98% )*
 Rainy Days (=>0.2mm) 16
( +2 ) *
 Inc days =>1mm) 11
 
 Dry Days 15
( -2 ) *
 Highest Daily Total 9.4
 mm
  (6th)
 Highest Rain Rate 33.5
 mm/hr
  (7th)
 Days with snowfall 1
 
   
 EVAPO-TRANSPIRATION
 Highest Daily 2.5
 mm (31st)
 Monthly Total 46.8
 mm
 WIND
 Monthly Average 2.1  mph  
 Highest Gust 32  mph (6th)
 Dominant Directions SSW  (33%)
NNW  (21%)
N  (12%)
W  (12%)
   
     
 SUNSHINE†
 Sunniest Day 8.3  hrs (11th)
 Monthly Sunshine 140.3  Hours
 Peak Solar Rad. 874  w/m² (21st)
 Total Solar Energy 6768  Langleys
 
   
 DEWPOINT
 Average at 14.00h 2.4 ºc
 Highest Reading 9.3  (  4th)
 Lowest Reading -6.3  (19th)
 RELATIVE HUMIDITY
 Average at 14.00h 56 %
 Lowest Reading 31 % (31st)
 Monthly Average 73 %
 BAROMETER
 Monthly Mean 1015.2  hPa  
 Highest Reading 1037.3  hPa  (10th)
 Lowest Reading 986.6  hPa  (  3rd)
* Compared to average 1984 - 2006
‡ 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 75% of total possible daily sunshine exposure this month. 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.
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 MARCH 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
 4.9 10.5 52 0.3 5.3 993.5 rs 1.3 3.0 24 W
2nd
 1.8 11.9 51 2.0 5.2 1004.7 fq 5.1 1.9 18 SSW
3rd
 4.7 12.9 50 2.2 4.3 1008.7 r 2.8 3.4 27 W
4th
 2.7 11.8 89 7.8 0.0 1005.4 fq 7.9 2.7 21 ESE
5th
 5.1 10.7 69 4.5 4.5 1012.0 rs 6.3 6.7 27 SSW
6th
 8.8 11.8 75 7.3 2.6 997.7 fs 9.4 5.2 32 SSW
7th
 6.1 11.9 57 3.4 5.2 1001.2 r 1.3 1.0 11 SSW
8th
 2.9 14.1 43 1.3 7.2 1022.2 rs 0.3 1.5 18 SSW
9th
 7.8 11.8 44 -0.1 5.7 1027.0 r 0.8 2.8 19 SSW
10th
 2.9 13.1 57 3.7 4.8 1035.7 fs 0.0 1.3 13 SSW
11th
 3.7 16.1 38 1.6 8.3 1029.3 f 0.0 1.8 19 SSW
12th
 3.6 18.2 39 3.8 7.5 1022.6 fs 0.0 0.2 12 SSW
13th
 6.7 13.5 48 1.2 4.0 1030.2 st 0.0 0.2 8 N
14th
 0.8 14.8 52 3.3 6.2 1034.4 f 0.0 0.1 7 SSW
15th
 3.7 14.8 41 1.4 8.0 1026.6 f 0.0 0.7 16 SSW
16th
 7.6 14.1 43 1.2 7.0 1025.4 f 0.0 1.3 13 W
17th
 7.5 15.7 54 6.2 4.0 1021.0 f 0.0 3.9 21 SSW
18th
 7.4 10.0 40 -4.2 6.5 1002.0 f 0.8 5.5 28 W
19th
 1.1 8.3 36 -6.3 3.3 997.1 r 0.5 3.0 24 NNW
20th
 1.4 5.8 73 -0.2 2.5 1011.1 rs 2.5 6.6 26 NNW
21st
 -0.1 8.3 48 -2.9 5.7 1017.5 st 0.0 3.4 19 NNW
22nd
 -2.2 7.1 69 0.4 0.5 1017.4 st 0.0 0.4 7 NNW
23rd
 4.1 6.8 85 3.5 0.1 1014.1 st 2.3 1.9 16 NNW
24th
 4.4 7.3 78 2.6 1.0 1016.5 fs 0.3 3.0 22 N
25th
 6.4 12.4 61 4.1 1.8 1017.5 rs 0.0 0.6 12 NNW
26th
 2.9 15.8 47 4.3 8.3 1016.8 fs 0.0 0.4 10 WSW
27th
 0.4 18.6 48 7.2 7.7 1013.4 f 0.0 0.1 8 WSW
28th
 2.3 16.8 43 3.6 5.1 1012.3 fs 0.0 0.1 7 NNW
29th
 6.2 8.6 78 4.0 0.8 1010.5 st 1.0 0.4 8 SSW
30th
 3.6 8.0 88 6.1 0.0 1011.0 st 3.0 0.7 13 NNW
31st
 6.3 14.2 39 0.4 8.0 1020.5 rs 0.0 2.2 16 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 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