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JULY 2010 daily and monthly summary

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JULY 2010
August
1st - 11th
1st, HP 1018 hPa N of Poland, LP 967 hPa at 20°W 60°N. 2nd, 3rd and 4th, long sunny periods. 5th, LP 992 hPa N of Shetland, HP 1032 hPa Azores, sunny start then cloudy pm brightening later, and same on 6th. 7th, some brief light drizzle 9am, too little to measure, mainly cloudy day. 8th, HP 1021 hPa W of Brittany, HP 1022 hPa C Europe, LP 985 hPa SE of Iceland, cloudy start, mainly sunny from mid morning. 9th, sunny from 09.30am onwards. 10th, sunny. 11th, sunny pm.
12th - 17th
A cloudy, unsettled and sometimes very windy spell. 12th, LP 1005 hPa WSW of Cornwall, Lp 1011 hPa Belgium, HP 1019 hPa northern North Sea, heavy shower around 07.00 as cold front clips W Kent. 13th, rain showers pre dawn, drizzle later, staying cloudy. 14th, LP 991 hPa S Ireland, mainly cloudy with showers pm. 15th, LP 992 hPa between Cornwall and Ireland, LP 989 hPa near Orkney I, rain showers early am clearing by 08.00, light showers later, very windy until evening, same again on 16th. 17th, sunny start and end to the day, otherwise mainly cloudy.
18th - 25th
18th, HP 1029 hPa Normandy, cloudy until 11am, sunny later. 19th, mainly sunny. 20th, cloudy but sunny intervals late pm and evening. 21st, one light brief rain shower pm giving trace of rain, sunny start and end to the day. 22nd, long sunny periods. 23rd, weak ridge from Azores 1031 hPa, sunny spelss pm and evening. 24th, some sunny intervals/spells but mainly cloudy. 25th, mainly cloudy with some sunny intervals.
26th - 31st
26th, cloudy with some sunny intervals, moderate drizzle around 9pm. 27th, another cloudy day sometimes dull but with brief sunny intervals. 28th, LP 1008 hPa Faeroe Isles, HP 1026 hPa Azores, mainly cloudy through to 30th. 31st, dull morning with drizzle around 10am to noon, becoming sunny later.
JULY 2010 MONTHLY SUMMARY
20 °C
ACTUAL TEMPERATURE
 AVERAGE
 Daily Maximum
24.0
  ºC ( + 1.4C )*
 Daily Minimum
14.6
  ºC ( + 1.4C )*
 Daily Mean
 ºC  
 EXTREMES
 High Maximum
29.9
  ºC (   9th )
 Low Minimum
10.6
  ºC ( 18th )
 Low Maximum
21.0
  ºC ( 13th )
 High Minimum
17.6
  ºC ( 25th )
 
   
 Days with max => 25 °C
9
   ( +2 )*
 Days with max < 20 °C
2
   ( -5 )*
 Days with mean => 20 °C
9
    
 
PRECIPITATION
 Monthly Total
8.9
  mm ( 20% )*
 Days with measurable precip
7
  Days ( -5 )*
   ...of which, days with >= 1.0 mm
4
  Days ( -5 )*
   ...and days with hail observed
0
  Days  
 Days with Thunder
0
  Days  
 
   
 RAIN RATE & EXTREMES
 High Rain Rate
11.2
  mm/hr ( 12th )
 High Rain Total in 1 day
3.3
  mm ( 15th )
 High Rain Total in 1 hour
1.0
  mm ( 15th, 04.30h)
 EVAPO-TRANSPIRATION
 Total for month
110.2
  mm  
 High Total for 1 day
5.1
  mm ( 9th )
APPARENT TEMPERATURE
 Low Wind Chill
10.6
  ºC ( 18th )
 DAVIS HEAT INDICES THW & THSW
 Low Temp/Hum/Wind Index
10.6
  ºC ( 18th )
 High Temp/Hum/Wind Index
29.2
  ºC (   9th )
 High Temp/Hum/Sun/Wind Index
35.0
  ºC (   9th )
 
DEWPOINT & HUMIDITY
 High Dewpoint
17.2
  ºC ( 2nd )
 Low Dewpoint
4.1
  ºC ( 17th )
 Average Dewpoint at 14h
10.9
  ºC  
 Low Relative Humidity
28
  % ( 9th )
 Average RH at 14h
47
  %  
WIND SPEED & DIRECTION
 Monthly Average
2.3
  mph  
 Windiest day (Average)
5.9
  mph ( 15th )
 Highest Gust
32
  mph ( 16th )
 Dominant Direction
SW
  ( 42% )
 
BAROMETER
 Monthly Mean
1014.6
  hPa  
 High Barometer
1025.9
  hPa (   6th )
 Low Barometer
999.3
  hPa ( 14th )
SUNSHINE
 Max Sensor Exposure to direct sun
9.5
  hours/day ( 15-16 possible )
 Calculated Monthly Sunshine Hours
160.4
  hours  
 Estimated Actual Hours (approx)
190
  hours  
 Sunniest Day Measured
9.3
  hours ( 10th )
 Days with no sunshine
0
  Days  
 
FOG
 Number of Days with Fog
0
  Days  
NEW SITE RECORDS SET THIS MONTH
  • Driest July since site recording began in 1984
  • Highest July wind speed gust ( 16th ) since anemometer installed Aug 2004
  • Windiest July day ( 15th ) since anemometer installed Aug 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 JULY 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
 12.8 24.8 24.6 48 12.8 7.2 1012.2 FS 0.0 1.8 13 SW  Sunny spells
2nd
 16.6 27.6 27.3 51 16.3 8.7 1011.4 RS 0.0 2.3 18 SW  Sunny periods
3rd
 16.7 25.4 24.6 35 8.1 8.7 1017.8 FS 0.0 1.5 11 SSW  Sunny periods
4th
 13.5 22.8 22.6 47 10.7 7.8 1018.7 FS 0.0 3.4 19 SW  Sunny periods
5th
 13.7 23.9 23.2 35 6.9 6.2 1019.6 ST 0.0 1.7 13 N  Sunny spells
6th
 12.5 22.6 21.8 38 6.8 6.3 1023.7 FS 0.0 1.5 13 SW  Sunny spells
7th
 13.5 22.7 21.6 55 12.2 4.8 1018.8 ST 0.0 2.3 16 SW  Cloudy
8th
 15.8 27.7 27.4 38 11.9 9.2 1017.0 FS 0.0 1.8 13 SW  Sunny
9th
 14.4 29.9 29.5 31 10.6 8.8 1014.8 FS 0.0 2.1 13 SSW  Sunny periods
10th
 15.2 28.9 28.6 39 13.3 9.3 1016.0 FS 0.0 2.0 16 SW  Sunny
11th
 16.2 25.7 25.2 43 11.7 5.8 1014.2 ST 0.0 2.6 18 SW  Sunny pm
12th
 15.4 23.1 22.9 43 9.7 3.2 1009.9 FS 1.0 1.3 16 SSW  SHRA am, cloudy
13th
 14.8 21.0 20.7 65 13.9 0.2 1007.1 FS 1.3 1.0 10 SE  Rain am
14th
 15.2 21.8 19.4 72 14.3 1.0 1001.3 FS 0.5 2.7 18 SW  SHRA pm, cloudy
15th
 14.4 19.9 18.0 61 10.4 3.7 1008.0 R 3.3 5.9 27 SW  SHRA am, cloudy
16th
 13.8 19.8 19.6 58 11.1 3.2 1010.4 RS 2.0 5.7 32 SW  SHRA am, cloudy
17th
 13.3 21.0 19.4 41 5.8 3.3 1019.7 R 0.0 3.1 17 SW  Cloudy
18th
 10.6 22.8 22.3 48 10.8 8.3 1024.3 FS 0.0 2.4 22 SW  Sunny pm
19th
 13.4 27.8 27.4 29 7.8 9.0 1019.4 F 0.0 1.6 14 SW  Sunny
20th
 16.3 27.3 27.1 34 9.9 1.8 1008.4 F 0.0 1.0 11 SE  Cloudy
21st
 16.7 23.7 20.8 55 11.5 5.8 1005.5 ST 0.0 3.2 18 SW  Sunny intervals
22nd
 12.3 22.8 21.7 50 10.8 7.8 1011.7 RS 0.0 2.3 17 SW  Sunny periods
23rd
 12.7 21.9 21.3 45 8.9 4.5 1019.2 RS 0.0 1.6 13 N  Sunny spells pm
24th
 13.0 24.1 23.5 35 7.1 4.2 1020.1 FS 0.0 1.8 14 SW  Sunny intervals
25th
 15.9 25.0 24.0 47 12.0 3.0 1014.9 FS 0.0 1.5 13 SSW  Cloudy
26th
 17.6 22.7 22.3 63 14.9 1.8 1015.4 ST 0.3 1.8 14 N  Cloudy
27th
 16.3 24.7 22.7 66 16.0 1.0 1016.1 FS 0.0 1.6 16 SW  Cloudy
28th
 15.6 24.9 23.0 39 8.3 4.3 1014.4 F 0.0 2.2 17 N  Sunny intervals
29th
 14.4 22.1 21.1 46 9.0 3.3 1014.7 FS 0.0 1.7 14 N  Cloudy
30th
 12.5 22.4 22.4 44 9.6 4.0 1013.2 FS 0.0 2.0 14 SW  Sunny intervals
31st
 16.7 23.8 23.7 59 15.2 4.2 1010.1 FS 0.5 2.5 14 SW  Drizzle 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 less than 25% 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: 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