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OCTOBER 2009 daily and monthly summary

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OCTOBER 2009
November
1st - 4th
1st: HP 1030 hPa mid Atlantic slipping W, LP 989 hPa near Latvia, dry passage of cold front during morning. 3rd: HP influence starts to decline, LP 969 hPa Faroe Is, slack HP S and C Europe.
5th - 11th
A changeable spell. 5th - 7th a very gloomy and wet period. 5th: LP 1002 hPa Normandy, more LP to W and SW including ex Tropical Storm 'Grace', occlusion over S England brings light to moderate rain from 07.30 lasting through the morning and afternoon. 6th, light intermittent rain from 10am to 12.30pm. 7th: LP 1005 hPa Biscay, associated cold and occluded fronts bring moderate and heavy rain from 13.30 lasting through much of the day and into the early morning. 8th, HP 1020 hPa over England, a sunny day. 9th, a cloudy morning, rain from cold front pm, sometimes heavy. 10th, light rain 02.30 to 03.30 with sunny periods from mid morning. 11th, more frontal rain during the afternoon.
12th - 18th
A steady rise in pressure, 12th HP 1029 hPa over Ireland, LP to W and E. Mostly sunny 12th and 13th but dull and rather gloomy 14th. 16th HP 1040 hPa W of Outer Hebrides, LP 1009 hPa Denmark, warm and cold fronts sweeping southwards of England. Mainly cloudy again 16 and 17th. 18th, HP 1025 hPa English Channel, sunny periods.
19th - 24th
Unsettled and cloudy. 19th, HP moves eastwards from C Europe into Russia, LP 972 hPa far to W of Ireland, light rain shower am. 20th, light rain late night continuing into the early morning of 21st with some drizzle in the afternoon and staying dull. 22nd, LP 993 hPa Ireland, LPs W Mediterranean some light rain late night continuing into morning 23rd, then fog am. 24th, drizzle after midnight from warm front with brief heavier burst after midday from cold front.

25th - 31st

25th, LP 988 hPa NE Scotland filling, HP 1021 hPa C France. 26th & 27th long sunny spells but 28th mainly cloudy after a bright start. 29th, fog am then bright with sunny intervals and fog overnight into the 30th, precipitation from condensation. HP 1035 hPa S Sweden, LP 980 hPa S of Iceland at 55°N. 31st, overcast with fog am, brighter pm.
OCTOBER 2009 MONTHLY SUMMARY
ACTUAL TEMPERATURE
 AVERAGE
 Daily Maximum
15.4
  ºC ( +0.5C )*
 Daily Minimum
 8.8
  ºC ( +0.9C )*
 Daily Mean
11.62
  ºC ( c. +0.5C)*
 EXTREMES
 High Maximum
18.2
  ºC ( 10th )
 Low Minimum
2.3
  ºC ( 18th )
 Low Maximum
11.4
  ºC ( 19th )
 High Minimum
15.8
  ºC (   7th )
 
   
 Days with max => 15 °C
20
   ( +5 )
 Days with max in range 10 - 15 °C
11
   ( -5 )
 Days with air frost
0
   ( -1 )
 
PRECIPITATION
 Monthly Total
51.2
  mm ( 60% )*
 Days with measurable precip
15
  Days ( ±0 )*
   ...of which, days with >= 1.0 mm
8
  Days ( -3 )*
   ...and days with snowfall observed
0
  Days  
 Days with hail
0
  Days  
 Days with Thunder
0
  Days  
 RAIN RATE & EXTREMES
 High Rain Rate
53.8
  mm/hr ( 9th )
 High Rain Total in 1 day
20.8
  mm ( 7th )
 High Rain Total in 1 hour
8.1
  mm ( 9th, 17.41h)
 EVAPO-TRANSPIRATION
 Total for month
36.3
  mm  
 High Total for 1 day
2.3
  mm ( 1st )
APPARENT TEMPERATURE
 Low Wind Chill
2.3
  ºC ( 18th )
 DAVIS HEAT INDICES THW & THSW
 Low Temp/Hum/Wind Index
2.2
  ºC ( 18th )
 High Temp/Hum/Wind Index
18.1
  ºC (   6th )
 High Temp/Hum/Sun/Wind Index
23.1
  ºC ( 10th)
 
DEWPOINT & HUMIDITY
 High Dewpoint
16.1
  ºC (   6th )
 Low Dewpoint
-0.1
  ºC ( 18th )
 Average Dewpoint at 14h
8.4
  ºC  
 Low Relative Humidity
39
  % (   4th)
 Average RH at 14h
67
  %  
WIND SPEED & DIRECTION
 Monthly Average
1.3
  mph  
 Windiest day (Average)
4.9
  mph ( 3rd )
 Highest Gust
25
  mph ( 3rd )
 Dominant Direction
SW
  ( 26% )
 
BAROMETER
 Monthly Mean
1015.5
  hPa  
 High Barometer
1032.6
  hPa ( 15th )
 Low Barometer
994.0
  hPa ( 21st )
SUNSHINE
 Max Sensor Exposure to direct sun
8
  hours/day (10 - 11 possible)
 Calculated Monthly Sunshine Hours
90.9
  hours  
 Estimated Actual Hours (approx)
103
  hours  
 Sunniest Day Measured
7.2
  hours ( 8th )
 Days with no sunshine
5
  Days  
 
FOG
 Number of Days with Fog
4
  Days  
NEW RECORDS SET THIS MONTH
 
‡ 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 60% 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 OCTOBER 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
 12.8 17.6 16.5 48 5.4 5.8 1017.8 ST 0.0 1.2 18 N  Sunny periods
2nd
 7.3 16.8 16.5 46 4.8 5.7 1017.6 F 0.0 1.3 12 SW  Sunny periods
3rd
 10.9 17.2 15.8 60 8.0 2.3 1006.5 F 0.0 4.9 25 SW  Mainly cloudy
4th
 9.6 16.9 15.4 43 2.9 4.7 1011.7 ST 0.0 1.4 18 SSW  Sunny spells
5th
 11.6 14.9 14.6 91 13.2 0.0 1006.4 FS 8.1 0.1 6 SE  Rain
6th
 12.8 17.7 17.6 91 16.1 0.0 1004.8 FS 1.8 3.1 21 SW  Rain am
7th
 15.8 15.9 13.1 88 11.2 0.0 1008.8 FS 20.8 2.7 22 SW  Rain
8th
 7.2 15.8 15.6 46 4.0 7.2 1017.6 RS 1.8 0.5 10 N  Sunny
9th
 6.9 13.4 12.9 73 8.2 0.3 1013.8 F 10.7 0.5 17 SE  Rain pm
10th
 11.2 18.2 18.1 58 9.7 5.7 1014.2 ST 0.5 0.9 13 N  Rain am, sunny pm
11th
 11.2 15.1 14.4 82 11.4 0.1 1011.7 F 1.3 1.1 13 SSW  Rain pm
12th
 8.0 14.9 14.8 58 6.6 5.0 1027.4 RS 0.3 1.6 19 N  Sunny periods
13th
 3.4 15.8 15.7 50 5.3 6.2 1029.3 FS 0.0 0.1 6 N  Sunny
14th
 9.0 12.4 11.9 70 6.6 0.0 1030.7 ST 0.0 0.2 7 SE  Overcast
15th
 3.8 16.4 16.3 46 4.6 6.8 1030.4 FS 0.0 0.1 8 N  Sunny
16th
 10.5 13.8 13.7 53 4.3 2.8 1030.5 ST 0.0 2.8 18 N  Cloudy
17th
 7.6 13.1 12.2 56 3.7 3.2 1027.4 FS 0.0 2.6 16 N  Cloudy
18th
 2.3 12.7 12.4 50 2.3 5.7 1022.0 F 0.0 0.3 6 SW  Sunny periods
19th
 3.6 11.4 11.2 67 5.3 0.5 1011.4 F 0.3 0.3 12 SE  SHRA am, cloudy
20th
 3.1 13.1 13.1 71 7.9 0.2 996.0 FS 0.5 0.8 17 SE  Cloudy. Rain night
21st
 11.9 13.1 12.3 88 10.3 0.0 994.6 FS 1.5 0.4 11 SE  Rain am.
22nd
 7.3 15.4 14.6 67 8.5 4.0 998.3 RS 0.5 0.9 17 SE  Rain night
23rd
 5.8 15.4 15.2 71 10.0 2.3 1008.5 RS 0.3 0.4 10 SW  Rain am
24th
 11.2 16.3 16.3 91 14.9 0.2 1003.3 F 2.5 3.3 20 SW  Rain am
25th
 11.1 16.3 15.7 64 8.9 4.3 1011.4 FS 0.0 4.8 21 SW  Sunny spells
26th
 9.5 16.1 15.6 57 7.1 6.5 1018.0 RS 0.0 1.5 13 SSW  Sunny
27th
 10.2 17.9 17.1 56 8.3 5.8 1018.0 FS 0.0 0.9 14 SE  Sunny periods
28th
 8.1 15.8 15.2 85 12.7 0.1 1017.6 FS 0.0 0.1 5 SSW  Cloudy
29th
 10.9 17.8 17.8 72 12.7 3.5 1021.0 FS 0.0 0.0 6 ESE  Fog am. Fair
30th
 9.1 14.0 13.9 76 9.7 0.7 1020.9 FS 0.3 0.4 10 SE  Fog am
31st
 9.4 16.4 15.8 91 14.3 1.3 1019.5 ST 0.0 0.2 7 SSW  Fog am
                         
‡ 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 sometimes use METAR codes: SHRA = rain showers; '+' = heavy;