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AUGUST 2010 daily and monthly summary

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AUGUST 2010
September

1st - 9th
1st, LPs surround the UK and Ireland, HP 1033 hPa north of Azores, cloudy day with only brief sunny intervals. 2nd, mainly cloudy again with some sunny intervals. 3rd, longer sunny spells but still mainly cloudy. 4th, LP 995 hPa Faeroe Isles, series of fronts across Ireland and the UK, showers around 3am, thunderstorm 3.30pm, more light rain showers later. 5th, sunny start, cloudier later with brief sunny intervals. 6th, LP 1002 hPa NW of Northern Ireland, again a bright start gives way to cloud with a fine light drizzle from early evening. 7th, rain showers from 5am to 07.30am, dull morning but brighter later with sunny intervals. 8th, LP 1014 hPa W of Denmark, LPs to NW and NE of UK, weak HP ridge from 1027 hPa near Azores. 9th, foggy start, clearing slowly cloudy morning then sunny periods pm.
10th - 15th
10th, LP 1003 hPa Scotland, moderate/heavy rain am from cold front, sunny spell pm then further light rain early evening from warm front on new LP 1009 hPa Bristol Channel. 11th, rain shower 06.30am, bright morning, cloudy middle of day, clearing later. 12th, LP drifting SSE down the North Sea, cloudy again with a light shower early evening giving a trace of rain. 13th, LP 1011 hPa NE of Norfolk, mainly cloudy once more with bands of showers pm and early evening tracking SEwards from the E Midlands, heavy shower at 23.20. 14th, LP 1016 hPa drifting slowly over W Kent & E Sussex, persistent moderate rain from 13.00h lasting 2 hours then heavy showers later with rumbles of thunder. 15th, light rain early morning, another cloudy day with brief sunny intervals.
16th - 21st
Continuing the theme of persistent cloud cover though mainly dry with only short sunny spells. 16th, LP 1005 hPa over Belgium, HP to W and SW, cloudy am, sunny spells pm. 17th, drizzle early am, cloudy later. 18th, sunny morning, cloudy later with few sunny intervals. 19th, another bright start before cloud builds but sunny spells later. 20th sunny start, becoming overcast after 11.00 and staying that way for the rest of the day also increasing breeze. 20th/21st, warmest night of the year here so far. 21st, drizzle early am, overcast and mainly dull. 22nd, mainly dull again but some sunny intervals, light rain showers pm, more persistent rain later.
22nd - 27th
22nd, mainly dull again but some sunny intervals, light rain showers pm, more persistent rain later as deepening LP swings into the SW of England. 23rd LP 992 hPa tracks across from SW into E Anglia overnight, fronts bring outbreaks of rain - with one extremely heavy burst of 5mm in 10 mins followed by persistent but lighter rain to 07.30am, some very light rain showers pm. 24th, sunny periods, cloudy spells and blustery. 25th, LP 1000hPa WSW of Cornwall moving ENE, dry morning, light/moderate rain from 13.30 with some heavier spells evening and into the night. 26th, intermittent drizzle from the LP system continues into early morning, staying mostly overcast with a brief glimpse of sunshine after midday, light rain late evening into night. 27th, moderate rain shortly after midnight, another dull day with few breaks in the cloud until early evening.
28th - 31st
28th, LPs to N and NE, HP over Atlantic W of Ireland, sunny / cloudy spells with one light rain shower early evening. 29th, LP 1003 hPa North Sea off NW Scotland, sunny spells; very strong, very brief squall with heavy rain mid afternoon giving site new highest August wind speed gust. 30th. HP 1027 hPa builds from the W over Northern Ireland, sunny and clear start then sunny spells later. 31st, long sunny periods.


AUGUST MONTHLY SUMMARY
ACTUAL TEMPERATURE
 AVERAGE
 Daily Maximum
20.6
 ºC (  -1.8C )*
 Daily Minimum
12.9
 ºC ( ±0.0C )*
 Daily Mean
16.40
 ºC  
 EXTREMES
 High Maximum
23.8
 ºC (   8th )
 Low Minimum
7.2
 ºC ( 31st )
 Low Maximum
16.8
 ºC ( 27th )
 High Minimum
18.6
 ºC ( 21st )
 
   
 Days with max => 25 °C
0
  ( -7 )*
 Days with max <20 °C
11
  ( +4 )*
 Days with mean => 20 °C
0
   
 
PRECIPITATION
 Monthly Total
71.1
 mm ( 140%)*
 Days with measurable precip
16
 Days ( +5 )*
   ...of which, days with >= 1.0 mm
9
 Days ( +1 )*
   ...and days with hail observed
0
 Days  
 Days with Thunder
2
 Days  
 
   
 RAIN RATE & EXTREMES
 High Rain Rate
110.7
 mm/hr ( 23rd )
 High Rain Total in 1 day
22.1
 mm ( 25th )
 High Rain Total in 1 hour
7.4
 mm ( 23rd, 01h50 )
 EVAPO-TRANSPIRATION
 Total for month
71.2
 mm  
 High Total for 1 day
3.4
 mm ( 9th )
APPARENT TEMPERATURE
 Low Wind Chill
7.2
 ºC ( 31st )
 DAVIS HEAT INDICES THW & THSW
 Low Temp/Hum/Wind Index
7.2
 ºC ( 31st )
 High Temp/Hum/Wind Index
23.2
 ºC (   8th )
 High Temp/Hum/Sun/Wind Index
28.9
 ºC (   8th )
 
DEWPOINT & HUMIDITY
 High Dewpoint
17.6
 ºC ( 21st )
 Low Dewpoint
0.9
 ºC ( 29th )
 Average Dewpoint at 14h
11.2
 ºC  
 Low Relative Humidity
34
 % ( 29th )
 Average RH at 14h
61
 %  
WIND SPEED & DIRECTION
 Monthly Average
2.3
 mph  
 Windiest day (Average)
4.7
 mph ( 21st )
 Highest Gust
32
 mph ( 29th )
 Dominant Direction
SW
 ( 37% )
 
BAROMETER
 Monthly Mean
1013.1
 hPa  
 High Barometer
1026.0
 hPa ( 31st )
 Low Barometer
994.0
 hPa ( 23rd )
SUNSHINE
 Max Sensor Exposure to direct sun
10.0
 hours/day (13-14 possible)
 Calculated Monthly Sunshine Hours
86.7
 hours  
 Estimated Actual Hours (approx)
120
 hours  
 Sunniest Day Measured
8.2
 hours ( 31st )
 Days with no sunshine
1
 Days  
 
FOG
 Number of Days with Fog
2
 Days  
NEW RECORDS SET THIS MONTH
  • Highest wind speed gust for any August, 32 mph, 29th, since 2004
  • Lowest maximum temperature, 23.8°C, for month of August since 1984
‡ 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 65% 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 AUGUST 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
12.3 21.5 19.8 55 10.5 1.3 1011.9 ST 0.0 1.4 17 SW  Cloudy
2nd
15.6 22.8 21.3 46 9.2 2.7 1015.3 ST 0.0 1.2 12 N  Cloudy
3rd
10.8 23.1 22.2 42 8.6 5.3 1014.3 FS 0.0 1.9 17 SW  Sunny spells
4th
14.3 20.4 17.9 76 13.6 1.5 1004.1 FS 2.3 2.5 18 SW  Thunder pm
5th
10.9 20.9 20.3 39 5.9 2.3 1011.7 RS 0.0 1.7 12 SSW  Cloudy
6th
9.4 20.4 17.6 74 12.9 0.8 1014.7 ST 0.0 2.7 19 SW  Cloudy
7th
15.9 22.2 21.2 58 12.6 3.0 1013.2 ST 0.8 2.7 19 SW  Rain showers am
8th
13.9 23.8 22.1 43 8.9 4.8 1018.6 FS 0.0 1.7 12 N  Sunny intervals
9th
11.8 22.7 22.6 46 10.4 6.3 1013.6 FS 0.0 2.3 16 SW  Sunny periods pm
10th
16.1 19.6 18.8 72 13.6 1.8 1009.6 FS 7.9 3.4 19 SW  Rain am
11th
12.4 20.3 19.9 58 11.4 3.2 1012.5 ST 0.3 1.4 12 SSW  Sunny spells
12th
12.5 19.8 18.3 56 9.4 2.0 1015.1 RS 0.0 1.7 16 N  Cloudy
13th
11.4 18.9 17.0 65 10.4 3.3 1015.3 FS 1.8 1.7 16 N  Rain showers pm
14th
12.9 17.6 15.2 84 12.5 1.7 1015.3 ST 5.3 0.4 8 N  Rain, Thunder pm.
15th
13.0 22.2 20.8 56 11.7 2.7 1018.4 FS 0.3 2.7 19 N  Cloudy
16th
12.9 23.3 20.9 56 11.8 5.0 1013.7 FS 0.0 3.6 22 N  Sunny spells pm
17th
14.2 18.4 17.4 80 13.9 1.2 1009.3 FS 0.5 2.2 14 SSW  Drizzle am, cloudy
18th
13.3 20.9 18.8 47 7.2 1.8 1007.4 FS 0.0 2.2 16 SW  Cloudy
19th
10.6 20.9 19.3 62 11.8 3.7 1012.8 RS 0.0 2.0 17 SW  Sunny spells
20th
14.8 21.7 20.0 75 15.4 0.7 1016.1 RS 0.0 3.4 17 SW  Cloudy
21st
18.6 21.0 19.9 83 16.9 0.0 1019.1 ST 0.3 4.7 19 SW  Overcast
22nd
18.3 21.7 20.4 80 16.9 0.8 1012.4 FS 3.0 2.4 14 SW  Rain evening
23rd
16.7 20.6 19.4 76 15.1 3.7 998.1 ST 17.0 4.6 24 SW  Rain+ night/am.
24th
11.3 20.6 19.2 54 9.6 4.5 1008.5 RS 0.0 3.8 22 SW  Sunny spells
25th
10.6 18.2 14.8 81 11.6 0.2 1012.9 FS 22.1 0.6 12 SW  Rain pm
26th
13.3 19.6 19.2 79 15.4 0.2 1003.5 FS 1.8 3.3 21 SW  Rain am, evening
27th
11.8 16.8 16.1 69 10.4 0.8 1010.8 R 6.6 1.4 13 N  Rain am, cloudy
28th
10.6 19.6 19.3 43 6.4 4.5 1018.7 FS 0.3 1.7 14 SSW  Rain shower eve.
29th
11.8 18.6 18.4 54 9.0 3.7 1011.5 F 0.8 3.1 32 N  Squall pm.
30th
9.3 19.4 18.7 50 8.1 5.0 1022.5 RS 0.0 2.9 20 N  Sunny spells
31st
7.2 21.3 21.1 40 7.0 8.2 1024.0 F 0.0 0.3 10 N  Sunny periods
                         
‡ 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 may use METAR codes: '+' = heavy