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MARCH 2009 daily and monthly summary

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MARCH 2009
April
1st - 7th
1st, chain of slack LPs from Iberia to NE of Iceland with HP to E. 3rd LP 975 hPa over Isle of Man with some light rain am, then heavier and windy during evening and into early morning 4th. 6th, LP dominates S and E Europe but weak ridge of HP brings long sunny periods here.
8th - 14th
8th, LP 963 hPa N of Scotland, HP 1031 hPa Azores, squally showers pm. 10th, LP 1002 hPa in N Sea, warm front rain early am and showers later. 13th, LP 982 hPA W of Ireland, HP 1022hpa Azores and 1024 hPa central France.
15th - 22nd
A very sunny period dominated by anticyclonic weather, though often hazy. 15th, HP 1033 hPa over English Channel. 17th, HP 1039 hPa off NE England coast with weak cold front crossing from late pm. 20th, HP 1034 hPa North Sea stretching eastwards to Poland, LP 1006 hPa Italy.
23rd - 29th
Unsettled and windy. 23rd, HP 1035 hPa to W of Ireland, LP 990 hPa over Norway/Sweden, cold front pm brings squally rain. 25th, LP 991 hPa North Sea, light rain just after midnight and showers during pm. Rain am of 26th with light showers later, more light showers on 27th. 28th LP 992 hPa crosses southern North Sea to E, squally showers with hail pm.
30th - 31st
Anticyclonic conditions start to reassert. HP extends a ridge from the Azores over NW Europe .

MONTHLY SUMMARY MARCH 2009
ACTUAL TEMPERATURE
 AVERAGE
 Daily Maximum
12.0
  ºC ( + 1.2C )*
 Daily Minimum
3.3
  ºC ( -0.6C )*
 Daily Mean
7.13
  ºC ( +0.4C )
 EXTREMES
 High Maximum
16.8
  ºC ( 18th )
 Low Minimum
-1.7
  ºC ( 21st )
 Low Maximum
7.3
  ºC (   4th )
 High Minimum
8.7
  ºC ( 12th)
 
   
 Days with max => 15 °C
4
   ( ±0 )*
 Days with max <=10 °C
6
   ( -4 )*
 Days with air frost
5
   ( -1 )*
 
PRECIPITATION
 Monthly Total
32.6
  mm ( 68% )*
 Days with measurable precip
12
  Days ( -2 )*
   ...of which, days with >= 1.0 mm
6
  Days ( -4 )*
   ...and days with snowfall observed
0
  Days  
 Days with Snow Cover
0
  Days  
 Days with Thunder
0
  Days  
 RAIN RATE & EXTREMES
 High Rain Rate
14.2
  mm/hr ( 8th )
 High Rain Total in 1 day
10.9
  mm ( 3rd )
 High Rain Total in 1 hour
3.0
  mm ( 3rd, 22.10h )
 EVAPO-TRANSPIRATION
 Total for month
51.2
  mm  
 High Total for 1 day
2.3
  mm ( 30th )
APPARENT TEMPERATURE
 Low Wind Chill
-1.7
  ºC ( 21st )
 DAVIS HEAT INDICES THW & THSW
 Low Temp/Hum/Wind Index
-1.8
  ºC ( 21st )
 High Temp/Hum/Wind Index
14.8
  ºC ( 16th )
 High Temp/Hum/Sun/Wind Index
24.2
  ºC ( 31st )
 
DEWPOINT & HUMIDITY
 High Dewpoint
8.0
  ºC ( 26th )
 Low Dewpoint
-5.2
  ºC ( 18th )
 Average Dewpoint at 14h
2.5
  ºC  
 Low Relative Humidity
25
  % ( 18th )
 Average RH at 14h
57
  %  
WIND SPEED & DIRECTION
 Monthly Average
2.2
  mph  
 Windiest day (Average)
5.1
  mph ( 8th )
 Highest Gust
39
  mph ( 3rd )
 Dominant Direction
SW
  ( 34% )
 
BAROMETER
 Monthly Mean
1014.3
  hPa  
 High Barometer
1035.8
  hPa ( 17th  )
 Low Barometer
980.1
  hPa (   4th )
SUNSHINE
 Max Sensor Exposure to direct sun
9
  hours/day (12 possible)
 Calculated Monthly Sunshine Hours
133.7
  hours  
 Estimated Actual Hours (approx)
150.0
  hours  
 Sunniest Day Measured
8.3
  hours ( 18th )
 Days with no sunshine
1
  Days  
 
FOG
 Number of Days with Fog
2
  Days  
NEW RECORDS SET THIS MONTH
 

* deviation from average 1984 - 2008
‡ 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 60-75% 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 2009
 
TEMPERATURE ºc
HUMIDITY
SUN ‡
PRESSURE
RAINFALL
WIND SPEED
DIRECTION
  WEATHER
 NOTES ‡
DATE
Low
(21-09h)
High
(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)
Max Gust
(mph)
Dominant
(Compass)
  Precipitation
 type etc ‡
                       
1st
 2.0 9.2 8.7 78 5.0 0.1 1006.1 ST 0.0 0.4 7 SE  Overcast
2nd
 2.2 11.1 10.1 52 0.6 5.3 1015.5 FS 0.0 1.9 12 SW  Sunny
3rd
 6.1 8.2 7.8 85 5.5 0.0 1003.0 F 10.9 5.0 39 SW  Rain pm
4th
 3.5 7.3 6.9 57 -1.0 3.7 981.8 ST 5.3 1.4 26 SW  Rain am
5th
 -0.1 7.9 6.7 68 1.2 2.2 993.1 R 0.0 0.8 12 N  Rain SH am
6th
 -0.6 10.3 9.4 45 -1.3 6.8 1005.6 ST 0.3 1.5 17 SW  Sunny
7th
 1.7 13.0 11.6 66 5.5 3.8 1009.9 F 0.0 3.1 22 SW  Fine
8th
 6.3 10.7 9.1 58 1.2 4.5 1001.5 F 3.6 5.1 27 SW  Rain SH+ pm
9th
 1.8 10.4 10.3 46 -0.9 5.3 1011.3 RS 0.3 4.0 20 SW  Rain SH
10th
 6.1 11.2 9.9 78 6.2 0.7 1007.5 R 5.3 3.0 18 SW  Rain
11th
 0.5 12.1 11.7 64 5.1 5.7 1022.7 ST 0.0 1.4 13 SW  Fog am
12th
 8.7 12.2 11.9 73 7.3 0.5 1019.1 FS 0.0 2.5 16 SW  Cloudy
13th
 5.8 11.5 10.4 73 5.8 2.2 1018.7 F 0.0 1.2 12 SSW  Cloudy
14th
 6.3 12.7 12.6 47 1.6 2.8 1016.3 R 0.0 2.1 14 SW  Bright
15th
 4.0 15.1 14.7 45 2.6 8.0 1029.9 ST 0.0 0.8 11 N  Sunny
16th
 2.2 16.1 15.9 47 4.6 8.2 1031.4 FS 0.0 0.7 10 SW  Sunny
17th
 2.0 14.8 14.3 53 4.8 7.8 1034.5 ST 0.0 0.8 12 SW  Sunny
18th
 2.6 16.8 16.2 33 -0.1 8.3 1029.4 F 0.0 0.4 12 SE  Mist am, sunny
19th
 -0.1 13.0 9.1 72 4.3 3.3 1028.6 RS 0.0 0.9 13 SW  Cloudy
20th
 1.0 14.6 14.1 35 -1.1 7.7 1030.5 FS 0.0 0.5 11 SE  Sunny
21st
 -1.7 14.4 14.0 44 1.9 7.7 1028.3 FS 0.0 0.6 10 N  Sunny
22nd
 5.8 14.5 14.4 47 3.3 6.7 1029.4 F 0.0 1.5 13 N  Sunny
23rd
 5.7 12.6 12.2 58 4.1 2.0 1012.4 FQ 0.8 4.1 27 N  Rain SH pm
24th
 4.6 10.7 10.3 39 -3.0 6.7 1017.2 FS 0.0 4.4 32 N  Sunny
25th
 5.8 11.6 11.4 58 3.4 2.7 1001.3 ST 1.5 4.3 26 N  Rain am
26th
 6.6 12.9 12.9 69 7.4 2.7 998.1 F 3.0 4.4 26 SW  Rain am
27th
 3.8 10.4 8.5 70 3.3 5.2 996.4 F 0.8 3.8 22 SW  Showers pm
28th
 2.1 9.8 8.7 55 0.1 2.0 999.5 R 0.5 3.3 26 N  Showers pm
29th
 0.6 8.6 7.4 52 -1.8 2.0 1012.4 FS 0.0 1.2 11 SSW  Cloudy
30th
 -0.9 13.7 12.4 38 -1.5 5.8 1019.9 ST 0.0 1.1 11 SW  Sunny
31st
 6.4 15.3 13.7 50 3.4 3.3 1022.4 FS 0.0 0.3 8 N  Cloudy
                         
‡ 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
‡ Weather Notes use METAR codes: SH = showers; '+' = heavy;