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NOVEMBER 2010 daily and monthly summary

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NOVEMBER 2010
December

1st - 7th
1st, HP ridge from Azores 1014 hPa, bright am, sunny spells pm. 2nd, mainly cloudy with some spells of weak sunshine. 3rd, bright am, cloudy pm with a trace of rain from light drizzle early evening. 4th, LP 993 hPa far W of Ireland, HP 1033 hPa Northern Spain, mildest November night in site records, sunny spells am, cloudy pm. 5th, dull and overcast with some drizzle evening, heavier rain after 23.00 into the morning of 6th, LP 1002 hPa S Sweden, LPs to NW and N, HP to S, sunny intervals am, cloudy pm. 7th, sunny / cloudy spells.
8th - 15th
8th, LP 958 hPa NW of Ireland tracking SSE, HP 1033 hPa NW of Azores, rain from early am becoming persistent and heavy lasting to late pm. 9th, LP 962 hPa near Channel Islands, showerr rain night with intermittent rain / drizzle am and heavier rain early pm. 10th, a sunny day with just a few brief cloudy intervals am. 11th, LP 955 hPA NW of Scotland, overcast and dull with rain from warm and cold fronts, clearing late pm with just brief brightness before dusk. 12th, bright am, rain pm and evening with showers around midnight. 13th, cloudy, rain late night into the early hours of 14th, more rain from midmorning through to early evening. 15th, UK surrounded by LP, misty am, sunny pm, misty again evening and night.
16th - 23rd
16th, frosty start, mainly sunny with some brief cloudy spells, precipitation from condensation am and light rain shower evening. 17th, LP 970 hPa W of Ireland, HP 1033 hPa Scandinavia, cloudy and dull, light rain evening into early am of 18th, further rain 07.00 to 08.30, bright spells am overcast pm with more rain evening. 19th, shallow fog am clearing by mid morning to give hazy sunny spells. 20th, some light rain early am, overcast and dull virtually day. 21st, another mainly overcast day with rain shower am but brightening a little pm. 22nd, mainly cloudy, light rain shower evening giving trace or rain. 23rd, cloudy and mostly dull
24th - 30th
24th, mostly sunny, becoming hazy during pm. 25th, complex synoptics - strongly negative NAO, HP 1043 hPa troughing towards LP 996 hPa Azores, Lp 1008 hPa Norwegian Sea and HP 1030 hPa N Sweden. 26th, sunny. 27th, precipitation from frostmelt/condensation, spells of hazy sun and cloud. 28th, sunny spells. 29th, HP 1037 hPa SE of Iceland to 1038 hPa over Norway, LP 996 hPa Finisterre and LP 991 hPa Poland/Ukraine, bright with sunny spells, light snow night pm. 30th, occlusion brings moderate then light snowfall am to depth of 2.0cm, light snow persists pm with heavier spells late evening increasing snow depth to 2.5cm.

NOVEMBER 2010 MONTHLY SUMMARY
ACTUAL TEMPERATURE
 AVERAGE
 Daily Maximum 8.1  ºC ( -2.2C )*
 Daily Minimum 3.9  ºC ( -1.0C )*
 Daily Mean
5.95
 ºC ( c. -1.5C )
 EXTREMES
 High Maximum 16.4  ºC (   3rd )
 Low Minimum -4.2  ºC ( 28th  )
 Low Maximum 0.8  ºC ( 27th  )
 High Minimum 14.3  ºC (   4th  )
 
   
 Days with max => 10 °C 9   ( -9 )*
 Days with max <5 °C 9   ( +5 )*
 Days with air frost 8   ( +4 )*
 
PRECIPITATION
 Monthly Total 62.5  mm ( 82% )*
 Days with measurable precip 17  Days ( ±0 ) *
   ...of which, days with >= 1.0 mm 11  Days ( -2 )*
   ...and days with snowfall observed 2  Days  
 Days with Snow Cover 1  Days  
 Max snow depth 2.5  cm  
 RAIN RATE & EXTREMES
 High Rain Rate 31.0  mm/hr ( 5th )
 High Rain Total in 1 day 17.3  mm ( 8th )
 High Rain Total in 1 hour 4.8  mm ( 8th, 09.05h)
 EVAPO-TRANSPIRATION
 Total for month 15.6  mm  
 High Total for 1 day 1.4  mm ( 4th )
APPARENT TEMPERATURE
 Low Wind Chill -4.4  ºC ( 26th )
 DAVIS HEAT INDICES THW & THSW
 Low Temp/Hum/Wind Index -4.3  ºC ( 28th )
 High Temp/Hum/Wind Index 16.1  ºC ( 4th )
 High Temp/Hum/Sun/Wind Index 19.4  ºC ( 4th )
 
DEWPOINT & HUMIDITY
 High Dewpoint 13.2  ºC (   5th )
 Low Dewpoint -6.5  ºC ( 28th )
 Average Dewpoint at 14h 4.3  ºC  
 Low Relative Humidity 53  % ( 10th )
 Average RH at 14h 80  %  
WIND SPEED & DIRECTION
 Monthly Average 2.0  mph  
 Windiest day (Average) 6.7  mph (   4th )
 Highest Gust 31  mph ( 11th )
 Dominant Direction SW  ( 27% )
 
BAROMETER
 Monthly Mean 1004.4  hPa  
 High Barometer 1021.5  hPa ( 16th )
 Low Barometer 965.4  hPa (   8th )
SUNSHINE
 Max Sensor Exposure to direct sun
5.5
 hours/day (8 - 9 possible)
 Calculated Monthly Sunshine Hours
32.9
 hours  
 Estimated Actual Hours (approx)
58.0
 hours  
 Sunniest Day Measured
4.0
 hours ( 10th)
 Days with no sunshine
9
 Days  
 
FOG
 Number of Days with Fog 2  Days  
NEW RECORDS SET THIS MONTH
  • Highest November minimum temperature in site records ( 3rd / 4th )
‡ 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 30% 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 2010
 
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
8.9 12.1 11.6 76 7.5 2.8 1013.6 ST 0.0 1.3 12 N  Sunny spells pm
2nd
6.8 14.4 14.3 68 8.4 2.8 1009.6 FS 0.0 5.2 21 SW  Sunny spells
3rd
12.7 15.6 15.2 65 8.7 2.5 1012.5 ST 0.0 4.9 21 SW  Cloudy
4th
14.3 16.4 16.0 77 12.0 2.8 1018.3 ST 0.0 6.7 24 SW  Sunny spells am
5th
13.8 15.6 15.6 84 12.9 0.0 1018.1 F 2.5 5.5 24 SW  Rain night pm
6th
8.2 11.3 11.2 65 4.9 1.0 1014.0 F 2.5 0.5 7 N  Rain night am
7th
1.4 8.3 8.3 72 3.5 2.0 1004.2 F 0.0 0.8 14 N  Cloudy
8th
2.4 6.9 5.5 90 4.0 0.0 965.8 F 17.3 1.9 25 SE  Rain
9th
4.4 8.5 8.1 90 6.6 0.0 975.7 R 5.1 1.9 16 N  Rain
10th
3.2 7.4 7.3 54 -1.4 4.0 998.5 R 0.0 2.8 20 N  Sunny
11th
-1.0 13.7 13.4 89 11.7 0.1 982.2 FQ 6.9 6.1 31 SW  Rain
12th
9.9 13.7 11.4 82 8.4 0.2 993.1 FS 7.6 5.9 28 SW  Rain
13th
9.4 10.6 10.4 73 5.8 0.0 993.1 FS 1.0 1.2 12 SSW  Rain night pm
14th
7.8 9.1 8.1 92 6.9 0.0 992.4 RS 7.1 0.7 13 N  Rain
15th
-1.0 5.9 4.7 93 3.7 1.5 1013.4 RS 0.0 0.0 3 WNW  Mist, sunny pm
16th
-2.1 7.4 6.9 93 5.9 1.7 1019.2 F 0.3 0.0 7 SE  Sunny am
17th
4.7 6.7 6.5 80 3.3 0.0 1005.0 F 1.8 1.4 17 SE  Cloudy
18th
5.1 8.9 8.8 85 6.4 0.3 1003.8 ST 5.1 0.5 11 SE  Rain
19th
1.6 6.7 6.7 93 5.7 3.2 1010.8 FS 0.0 0.0 3 NE  Fog am
20th
3.6 7.1 6.7 92 5.5 0.2 1011.4 FS 0.3 0.3 7 SE  Drizzle night/am
21st
5.4 7.9 7.6 84 5.1 0.2 1008.5 FS 0.3 1.6 14 N  Rain shower am
22nd
4.7 7.7 7.3 79 3.9 0.0 1006.8 FS 0.5 1.5 11 N  Rain shower pm
23rd
4.2 7.0 6.8 74 2.5 0.5 1009.7 FS 0.0 1.6 12 N  Cloudy
24th
0.5 4.8 4.6 73 0.2 1.5 1008.2 FS 0.0 1.0 8 SSW  Sunny periods
25th
0.5 2.0 1.4 73 -2.9 0.0 1005.7 FS 0.0 2.7 17 N  Cloudy
26th
-2.3 2.6 2.6 70 -2.4 1.8 1004.3 FS 0.0 0.8 11 SSW  Sunny
27th
-3.7 0.8 0.7 84 -1.7 1.5 1002.0 ST 0.3 0.2 7 N  Hazy sunshine
28th
-4.2 1.8 1.7 69 -3.4 1.5 1003.7 ST 0.0 0.1 6 NNE  Sunny spells
29th
-1.6 1.3 0.8 80 -2.2 0.8 1009.1 ST 0.3 1.9 16 N  Snow night pm
30th
-0.3 0.8 0.4 91 -0.9 0.0 1009.7 FS 3.6 0.1 6 NE  Snow
                         
‡ 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 due to obstruction. The sensor receives less than 30% of total possible sunshine exposure after the 10th of 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: OVC = overcast; SHRA = rain showers; '+' = heavy; CAVOK = no cloud below 5000 ft & visibility> 10 km & no fog, precipitation or snow; SN = snow; RASN = Rain and snow