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NOVEMBER 2009 daily and monthly summary

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NOVEMBER 2009
December

1st - 7th
1st, a stormy start, LP 988 hPa off Pembrokeshire tracking NE and deepening, warm and cold fronts bring persistent rain - sometimes heavy - through the morning from 08.30 to 13.00h. 3rd, LP 966 hPa coast of N Scotland, light rain and drizzle from 3am to 10am from warm front followed by heavy showers from cold front from 12.30 for an hour. 4th, moderate rain shower pm. 5th, light rain shower late pm. 6th, mainly cloudy with light rain late pm followed by heavier showers in evening. 7th, a sunny day with light rain from 22.30h into the following morning.
8th - 12th
8th, LP 994 hPa English Channel, HP 1033 hPa Azores, moderate rain after midnight followed by heavier showers before dawn. 9th LP moved ENE allowing a weak ridge of HP, sunny periods after early mist (precipitation from condensation). 10th, a foggy morning and and a mainly dull day with drizzle in the afternoon. 11th, another dull day with light rain showers. 12th, bright start clouding over with moderate/heavy rain evening and night.
13th - 16th
Stormy and very wet. 13th - wettest day here since 23/11/2003 - vigorous LP with triple point centres 971 hPa to NW, 972 hPa to W and 981 hPa to SW showing cyclogenesis with numerous fronts. Moderate / heavy showers very early followed by persistent heavy rain from 05.00 to 09.00, especially heavy around 08.00 and further heavy rain until early afternoon. 14th, heavy showers and some violent squalls after midday. 15th, LP 968 hPa Faeroe I, calmer conditions, moderate rain very early am from occlusion followed by a trough with heavy/very heavy rain from 04.30 to 07.00. 16th, LP 986 & 982 hPa over Ireland. 16th, heavy showers early am.
17th - 23rd
Very unsettled. 18th, LP 982 hPa Denmark, LP 956 hPa 20° W Atlantic, light showers very early am. 20th, light rain from 06.15 to past midday. 21st LP 954 hPa 20° W Atlantic, light rain from midafternoon through eveing and night. 22nd, LP 962 hPa near Donegal, frequent moderate and heavy showers, some squally one with hail. 23rd, yet more rain and showers mostly am.
24th - 30th
Continuing very unsettled and windy. 24th, a rather dull day with drizzle after 18.00h from warm front. 25th, LP 958 hPa N of Hebrides, squally showers very early am as cold front passes then bright with a heavy rain shower pm. 26th, again squally showers early on, one very heavy, with another shower pm and rain early in the night. 27th, LP 972 hPa central Norway and 977 hPa near Shetland, more moderate rain before dawn from occlusion. 28th, moderate rain from cold front from 01.00 finishing with one very heavy downpour around 05.00 then light/moderate rain from warm front after 17.30 with heavy showers later. 29th, LP 969 hPa Devon, cold front bring yet more heavy showers intermittently from midnight through the morning and more intermittently in the afternoon but one thundery.

NOVEMBER 2009 MONTHLY SUMMARY
ACTUAL TEMPERATURE
 AVERAGE
 Daily Maximum
11.7
 ºC ( +1.3C )*
 Daily Minimum
7.4
 ºC ( +2.6C )*
 Daily Mean
9.48
 ºC ( + 2.0C )
 EXTREMES
 High Maximum
16.1
 ºC (   1st  )
 Low Minimum
1.8
 ºC ( 10th )
 Low Maximum
6.9
 ºC ( 10th )
 High Minimum
12.0
 ºC ( 20th )
 
   
 Days with max => 15 °C
2
  ( ±0 )
 Days with max < 10 °C
8
  ( -3 )
 Days with air frost
0
  ( -3 )
 
PRECIPITATION
 Monthly Total
181.8
 mm ( 254% )
 Days with measurable precip
27
 Days ( +11 )*
   ...of which, days with >= 1.0 mm
21
 Days ( - 9 )*
   ...and days with snowfall observed
0
 Days  
 Days with Snow Cover
0
 Days  
 Days with Thunder/hail
1/1
 Days  
 RAIN RATE & EXTREMES
 High Rain Rate
72.4
 mm/hr ( 28th )
 High Rain Total in 1 day
35.1
 mm ( 13th )
 High Rain Total in 1 hour
10.4
 mm ( 13th, 14.12h)
 EVAPO-TRANSPIRATION
 Total for month
24.8
 mm  
 High Total for 1 day
1.5
 mm ( 14th )
APPARENT TEMPERATURE
 Low Wind Chill
1.8
 ºC ( 10th )
 DAVIS HEAT INDICES THW & THSW
 Low Temp/Hum/Wind Index
1.8
 ºC ( 10th )
 High Temp/Hum/Wind Index
16.0
 ºC (   1st )
 High Temp/Hum/Sun/Wind Index
17.4
 ºC ( 21st )
 
DEWPOINT & HUMIDITY
 High Dewpoint
14.6
 ºC (   1st )
 Low Dewpoint
0.0
 ºC ( 30th )
 Average Dewpoint at 14h
6.7
 ºC  
 Low Relative Humidity
57
 % (   2nd )
 Average RH at 14h
76
 %  
WIND SPEED & DIRECTION
 Monthly Average
3.5
 mph  
 Windiest day (Average)
8.3
 mph ( 18th )
 Highest Gust
44
 mph ( 14th )
 Dominant Direction
SW
 ( 57% )
 
BAROMETER
 Monthly Mean
1001.0
 hPa  
 High Barometer
1019.7
 hPa ( 21st )
 Low Barometer
982.7
 hPa (   3rd )
SUNSHINE
 Max Sensor Exposure to direct sun
5.5
 hours/day (8 - 9 possible)
 Calculated Monthly Sunshine Hours
39.3
 hours  
 Estimated Actual Hours (approx)
60.0
 hours  
 Sunniest Day Measured
5.2
 hours ( 2nd )
 Days with no sunshine
5
 Days  
 
FOG
 Number of Days with Fog
2
 Days  
NEW SITE RECORDS SET THIS MONTH
  • Highest ever rainfall total for November (previously 147.0 mm in 2002)
  • Highest number of rain days for any calendar month
  • All time site high wind speed gust 44mph.
‡ 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 40 - 55% 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 NOVEMBER 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
9.4 16.1 15.3 89 13.5 0.3 995.8 F 15.2 3.8 27 SW  Rain am.
2nd
6.3 12.3 11.8 59 4.0 5.2 1000.1 FS 0.0 1.7 13 SSW  Sunny.
3rd
8.4 13.7 11.9 87 9.8 0.2 983.3 F 7.1 2.3 26 SW  Rain am.
4th
5.4 11.8 11.1 62 4.0 4.3 985.3 FS 1.0 2.4 18 SW  SHRA pm.
5th
7.3 11.8 11.3 69 5.8 2.5 993.5 R 0.3 2.3 13 SW  SHRA pm.
6th
7.2 11.5 10.9 72 6.1 0.3 1000.2 F 4.6 2.2 19 SSW  Rain pm
7th
4.4 10.1 10.1 61 2.9 4.5 995.7 ST 1.0 1.2 11 SSW  Rain night
8th
6.6 8.7 8.5 85 6.1 0.0 1005.6 R 6.6 0.4 12 SE  Rain am
9th
3.6 7.9 7.7 81 4.7 3.8 1017.5 FS 0.3 0.7 10 N  Sunny pm
10th
1.8 6.9 6.5 92 5.3 0.0 1010.2 F 0.5 0.1 6 SW  Fog am, drizzle pm
11th
5.1 9.4 9.4 92 8.2 0.1 1004.8 F 0.8 0.5 18 SE  SHRA
12th
7.3 13.3 13.3 76 9.2 1.8 1001.4 FS 4.3 3.4 22 SW  Rain eve & night
13th
9.6 15.3 12.9 91 11.5 0.0 998.1 FS 35.1 3.8 28 SW  Rain
14th
11.4 13.3 11.8 81 8.6 0.2 990.1 F 5.6 7.1 44 SW  SHRA+
15th
8.1 12.9 12.3 77 8.4 2.8 1004.8 ST 8.4 1.5 12 SSW  Rain am
16th
7.3 13.1 12.6 63 5.7 1.0 1000.7 RQ 4.1 4.9 26 SW  SHRA+ am
17th
9.8 12.9 12.3 64 5.7 2.3 1007.5 ST 0.0 4.7 19 SW  Sunny spells
18th
10.1 14.3 14.3 68 8.5 0.5 1011.4 RS 0.8 8.3 30 SW  Rain am. Cloudy
19th
11.9 13.2 13.0 65 6.6 3.0 1011.9 FS 0.0 6.1 22 SW  Sunny spells
20th
12.0 13.6 13.1 87 11.0 0.0 1013.1 R 5.1 4.0 25 SW  Rain am.
21st
7.3 14.9 14.1 77 10.1 1.2 1011.1 F 8.4 2.7 19 SW  Rain pm.
22nd
7.7 11.4 9.6 80 6.3 0.5 999.0 F 5.6 6.1 28 SW  SHRA+
23rd
8.2 12.8 12.5 85 10.0 0.5 995.3 F 4.1 6.0 26 SW  Rain am
24th
8.7 13.7 13.5 72 8.5 0.5 1006.5 FS 0.8 6.6 34 SW  Rain night
25th
8.8 11.2 9.6 71 4.6 1.5 999.3 ST 4.3 5.8 31 SW  SHRA+
26th
7.0 9.7 9.4 69 4.0 1.3 1001.0 FS 6.3 4.5 27 SW  SHRA+/++
27th
4.6 8.6 8.0 73 3.5 0.3 998.8 ST 5.3 2.9 19 SSW  Rain am
28th
5.5 8.4 7.7 66 1.7 0.6 993.7 ST 21.8 3.0 24 SW  Rain / SHRA++
29th
6.1 10.3 8.3 74 4.0 0.0 984.3 FS 17.3 2.7 25 SW  Rain / SHRA++
30th
5.0 6.7 5.6 85 3.2 0.1 999.2 RQ 7.1 2.6 20 N  Rain 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 may use METAR codes: SHRA = rain showers; '+' = heavy;