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MARCH 2008 daily and monthly summary

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MARCH 2008
April 2008

1st - 7th
After clearance of cold front early hours of 1st a weak anticyclonic flow covers most of the southern UK. Westerly flow dominates with a spell of light rain from warm front on morning of 7th.
8th - 15th
Still with a westerly flow and looking very unsettled, cold front clears overnight 8th/9th. Stormy on the 10th as 950 hPa low approaches C England with cold front and occlusions bringing heavy rain during the morning and squally showers later. Breezy with showers 11th and 12th. Rain late pm of 13th, one shower on 14th and rain from late pm of 15th. Over 200% of normal rainfall for first 15 days of March.
16th - 20th
Rain from cold front on 16th, very dismal day with rain and drizzle, and temperature falling all day. From 17th HP lies to the NW, with northerlies over much of the UK, mostly cloudy with occasional sunny spells. On 20th LP to N of Scotland brings a warm front with rain, becoming milder during the night.
21st - 25th
Passage of cold front early hours of 21st with heavy showers dragging down a strong and chilly Polar Maritime airflow for Easter weekend. Rain/sleet showers early morning of 22nd and a strong wind chill during the day. Light/moderate snow for 2 hours morning of 23rd, not settling, followed by sleet then drizzle. More light snow on morning of 24th again not settling.
26th - 31st
LPs from Atlantic bring return of less cold weather, but still unsettled. Showers on 26th (evening) and 27th (night) with more general rain during daytime of 28th as warm and cold fronts pass. More light rain overnight 29th/30th with moderate spells, then showers in mid morning. Fog morning of 31st.


MARCH 2008 MONTHLY SUMMARY
ACTUAL TEMPERATURE
 AVERAGE
 Daily Maximum
10.1
 ºC ( -0.7C )*
 Daily Minimum
4.2
 ºC ( +0.3C ) *
 Daily Mean
6.8
 ºC  
 EXTREMES
 High Maximum
15.9
 ºC ( 15th )
 Low Minimum
-1.3
 ºC ( 23rd )
 Low Maximum
3.3
 ºC ( 23rd )
 High Minimum
9.1
 ºC ( 15th )
 
   
 Days with Air Frost
2
   
 Days with max > 15º
1
   
 Days with max < 5º
2
   
 
PRECIPITATION
 Monthly Total
90.3
 mm ( 195% )*
 Days with measurable precip
21
 Days ( +7 )*
   ...of which, days with >= 1.0 mm
17
 Days ( +7 )*
   ...and days with snowfall observed
2
 Days  
 Days with Snow Cover
0
 Days  
 Days with Thunder
0
 Days  
 RAIN RATE & EXTREMES
 High Rain Rate
52.6
 mm/hr ( 28th )
 High Rain Total in 1 day
26.7
 mm ( 10th )
 High Rain Total in 1 hour
6.6
 mm ( 10th, 0730h)
 EVAPO-TRANSPIRATION
 Total for month
40.2
 mm  
 High Total for 1 day
2.4
 mm ( 21st )
APPARENT TEMPERATURE
 Low Wind Chill
-3.2
 ºC ( 22nd )
 DAVIS HEAT INDICES THW & THSW
 Low Temp/Hum/Wind Index
-1.9
 ºC ( 23rd )
 High Temp/Hum/Wind Index
15.1
 ºC ( 15th )
 High Temp/Hum/Sun/Wind Index
22.3
 ºC ( 15th )
 
DEWPOINT & HUMIDITY
 High Dewpoint
9.5
 ºC ( 11th )
 Low Dewpoint
-7.1
 ºC (  5th )
 Average Dewpoint at 14h
2.2
 ºC  
 Low Relative Humidity
31
 % (  5th )
 Average RH at 14h
63
 %  
WIND SPEED & DIRECTION
 Monthly Average
3.4
 mph  
 Windiest day (Average)
7.3
 mph ( 10th )
 Highest Gust
38
 mph (10th )
 Dominant Direction
SSW
 ( 33% )
 
BAROMETER
 Monthly Mean
1005.7
 hPa  
 High Barometer
1035.4
 hPa ( 5th )
 Low Barometer
963.7
 hPa ( 10th )
SUNSHINE
 Max Sensor Exposure to direct sun
8
 hours/day (10 - 12 possible)
 Calculated Monthly Sunshine Hours
66.2
 hours  
 Estimated Actual Hours (approx)
80
 hours  
 Sunniest Day Measured
6.7
 hours ( 5th )
 Days with no sunshine
3
 Days  
 
FOG
 Number of Days with Fog
1
 Days  
NEW SITE RECORDS SET THIS MONTH
  • Wettest March day.
  • Highest March wind gust since anemometer installed in 2004
‡ 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 MARCH 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
8.0 12.5 12.1 49 1.7 5.5 1010.9 rs 0.8 6.0 35 W
2nd
9.6 12.8 12.0 54 3.0 1.5 1009.8 st 0.0 3.7 22 W
3rd
3.6 9.8 9.2 40 -3.7 5.3 1010.3 f 0.0 2.7 21 W
4th
0.4 8.9 8.3 47 -2.3 4.3 1025.9 r 0.0 4.1 20 N
5th
-0.9 9.6 9.1 33 -6.4 6.7 1032.4 f 0.0 1.7 16 SSW
6th
6.6 12.0 11.9 60 4.4 0.3 1021.4 f 0.0 2.3 14 SSW
7th
6.6 11.4 11.4 46 0.2 5.7 1010.8 st 1.0 3.7 19 SSW
8th
2.3 9.8 8.8 87 6.8 0.1 1003.3 f 0.8 4.5 22 SSW
9th
5.6 11.1 10.1 62 3.1 2.0 994.6 fs 5.1 3.1 18 SSW
10th
4.6 8.1 6.6 86 4.4 1.0 964.9 fq 26.7 7.3 38 SSW
11th
5.8 14.0 12.2 82 9.2 0.8 984.4 f 2.0 6.0 26 SSW
12th
4.8 10.2 9.2 49 -1.0 1.7 1003.8 rq 1.3 5.9 30 W
13th
5.7 11.1 10.9 69 5.4 0.0 1012.0 fs 1.8 3.0 18 SSW
14th
7.7 11.8 11.8 71 6.7 0.2 1011.8 st 0.3 1.1 10 SSW
15th
9.1 15.9 15.5 60 7.8 3.3 1001.3 f 4.3 0.9 11 SE
16th
9.0 9.0 7.5 90 6.0 0.0 998.3 r 6.3 4.4 22 N
17th
4.7 9.2 7.3 60 0.1 0.7 1017.3 st 0.0 2.3 13 N
18th
1.4 6.8 6.3 57 -1.6 0.2 1019.9 st 0.0 2.6 16 N
19th
2.4 8.9 7.5 55 -1.0 2.3 1022.1 rs 0.0 3.3 19 N
20th
1.8 9.4 7.7 66 1.7 0.8 1011.1 fq 2.5 3.4 20 SSW
21st
4.2 9.9 9.2 42 -3.5 6.0 986.7 fs 7.4 5.8 25 N
22nd
2.2 5.7 5.4 61 -1.5 1.5 998.4 r 1.8 6.3 29 N
23rd
-1.3 3.3 3.1 86 0.9 0.0 995.3 f 1.3 2.4 18 SSW
24th
0.1 4.9 3.8 80 0.7 1.8 998.3 fs 0.5 1.2 11 SSW
25th
0.3 6.8 6.1 50 -3.6 2.3 1007.0 fs 0.0 1.7 16 N
26th
4.6 13.0 12.3 50 2.1 2.2 996.4 f 2.5 0.9 11 SSW
27th
3.9 11.4 9.4 67 3.6 2.5 1000.4 r 1.5 0.7 10 SE
28th
1.5 10.3 9.3 89 7.6 1.8 993.3 f 9.7 4.3 28 SSW
29th
5.3 11.8 11.6 65 5.2 1.2 1007.9 f 4.6 5.6 25 SSW
30th
7.2 12.6 11.8 67 5.8 4.0 1000.4 rs 8.1 3.2 21 SSW
31st
3.5 11.4 10.6 69 5.2 0.5 1015.4 r 0.0 0.7 12 ESE
                       
‡ 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 70% 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