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JULY 2012
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‡ 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" |
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DAILY STATS JULY 2012 |
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TEMPERATURE ºc |
HUMIDITY |
SUN ‡ |
PRESSURE |
RAINFALL |
WIND SPEED |
DIRECTION |
WEATHER NOTES ‡ |
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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 ‡ |
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1st |
10.7 | 17.6 | 13.7 | 83 | 10.9 | 1.7 | 1014.4 | RS | 3.0 | 3.3 | 19 | SSW | Rain showers |
2nd |
10.7 | 17.8 | 16.4 | 70 | 11.0 | 1.5 | 1014.4 | FS | 1.5 | 3.2 | 18 | SW | Rain pm/evening |
3rd |
14.6 | 17.3 | 16.6 | 85 | 14.1 | 0.2 | 1013.0 | FS | 2.8 | 1.8 | 12 | SW | Rain/drizzle |
4th |
15.2 | 22.1 | 21.3 | 65 | 14.4 | 4.0 | 1007.8 | FS | 2.3 | 1.6 | 16 | SW | Rain am |
5th |
13.9 | 23.1 | 22.6 | 47 | 10.7 | 5.3 | 1007.9 | ST | 0.0 | 1.2 | 13 | SW | Sunny spells |
6th |
14.1 | 20.0 | 19.2 | 65 | 12.5 | 4.3 | 1005.4 | ST | 2.0 | 1.2 | 16 | SW | Rain pm |
7th |
11.1 | 17.8 | 16.2 | 81 | 12.9 | 1.5 | 1006.3 | FS | 4.8 | 1.0 | 14 | SE | Rain showers |
8th |
12.9 | 20.3 | 18.6 | 70 | 13.0 | 2.7 | 1004.6 | RS | 12.2 | 1.0 | 11 | N | Rain |
9th |
13.9 | 17.4 | 16.2 | 77 | 12.1 | 0.3 | 1010.7 | RS | 0.0 | 2.4 | 12 | SSW | Cloudy |
10th |
11.6 | 17.1 | 14.9 | 83 | 12.1 | 1.7 | 1009.4 | FS | 4.1 | 2.1 | 17 | SSW | Rain showers |
11th |
10.8 | 18.6 | 13.6 | 83 | 11.0 | 3.8 | 1010.1 | ST | 14.2 | 2.6 | 20 | SSW | T-storms pm |
12th |
9.2 | 18.1 | 17.9 | 52 | 7.9 | 3.8 | 1011.6 | FS | 6.6 | 2.5 | 16 | SW | Rain pm/eve |
13th |
11.9 | 17.9 | 16.3 | 70 | 10.8 | 2.5 | 1000.3 | FS | 0.5 | 3.5 | 18 | SW | Rain night am |
14th |
12.4 | 18.2 | 14.3 | 84 | 11.6 | 1.2 | 1004.8 | R | 12.4 | 2.0 | 14 | SSW | Rain showers + |
15th |
11.1 | 18.1 | 16.4 | 54 | 7.1 | 3.5 | 1015.7 | R | 0.5 | 1.5 | 13 | SSW | Rain am |
16th |
11.4 | 15.4 | 14.4 | 86 | 12.1 | 0.0 | 1018.4 | FS | 1.3 | 4.4 | 22 | SW | Rain/drizzle |
17th |
13.2 | 21.7 | 21.1 | 62 | 13.5 | 3.7 | 1020.9 | FS | 0.0 | 3.3 | 16 | SSW | Sunny spells |
18th |
13.6 | 18.1 | 16.6 | 79 | 12.9 | 1.3 | 1010.9 | F | 2.8 | 4.1 | 19 | SW | Rain pm/eve |
19th |
12.7 | 19.1 | 17.7 | 63 | 10.6 | 3.0 | 1010.4 | RS | 0.0 | 2.5 | 19 | SSW | Sunny spells |
20th |
11.1 | 19.1 | 17.9 | 59 | 9.8 | 2.8 | 1015.1 | RS | 0.0 | 0.9 | 10 | N | Cloudy |
21st |
10.6 | 20.6 | 20.1 | 50 | 9.3 | 3.3 | 1023.0 | RS | 0.0 | 0.6 | 10 | SSE | Sunny spells |
22nd |
9.5 | 22.7 | 22.6 | 39 | 7.9 | 8.3 | 1025.5 | FS | 0.0 | 1.5 | 13 | SW | Sunny |
23rd |
10.7 | 26.1 | 25.9 | 40 | 11.3 | 9.0 | 1020.8 | FS | 0.0 | 1.6 | 16 | SW | Sunny |
24th |
12.1 | 30.4 | 29.4 | 30 | 10.1 | 9.0 | 1015.2 | FS | 0.0 | 0.4 | 10 | SE | Sunny |
25th |
12.6 | 30.9 | 30.3 | 33 | 12.2 | 8.3 | 1014.6 | FS | 0.0 | 0.4 | 10 | SE | Sunny |
26th |
14.9 | 28.6 | 28.3 | 41 | 13.8 | 8.8 | 1015.9 | FS | 0.0 | 0.4 | 10 | SE | Sunny |
27th |
13.9 | 25.1 | 24.0 | 56 | 14.7 | 3.2 | 1010.0 | FS | 1.5 | 0.5 | 10 | N | Rain night pm |
28th |
13.9 | 21.5 | 21.5 | 39 | 7.0 | 4.3 | 1008.7 | FS | 0.0 | 1.1 | 11 | N | Sunny spells |
29th |
10.2 | 19.3 | 18.4 | 54 | 8.9 | 4.7 | 1010.4 | ST | 3.6 | 2.7 | 21 | SSW | Rain shower pm |
30th |
8.1 | 19.4 | 18.6 | 42 | 5.4 | 4.3 | 1014.2 | ST | 0.0 | 2.2 | 17 | SSW | Sunny spells |
31st |
12.1 | 20.2 | 18.6 | 74 | 13.9 | 2.2 | 1012.9 | ST | 0.0 | 2.1 | 16 | SSW | Cloudy |
| ‡ 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 |
| 1st | LP 998 hPa N of Shetland. Bright morning with a rain shower around 10.00. Sunny spells then a period of cloud and moderate rain showers, clearing in the evening. |
| 2nd | LP 1006 hPa NW Ireland. Some bright spells and sunny intervals in the morning, becoming more cloudy in the afternoon with drizzle by early evening. |
| 3rd | LP 999 hPa To west of Ireland. Early morning rain followed by drizzle on and off through the day. Some brief weak sunshine in the evening. |
| 4th | LP 1001 hPa To west of Ireland. Early morning rain and drizzle ending around 09.00. Mainly cloudy morning but brightening up in the afternoon to give some sunny spells. |
| 5th | LP 1007 hPa West Brittany. A mainly cloudy morning with a couple of sunny intervals, some sunny spells in the afternoon and evening. |
| 6th | LP 1004 hPa Central England. A dull morning with some intermittent light rain. Spell of moderate rain for an hour from 12.45. Brighter with sunny intervals for most of the afternoon. |
| 7th | LP 998 hPa Bristol Channel. Heavy rain shower around 09.00. Further showers with brief sunny intervals but mainly cloudy and dull. More persistent rain from late evening. |
| 8th | LP 1003 hPa Thames Estuary moving slowly ENE. Some heavy bursts of rain overnight with a short dry spell in midmorning, Further spells of rain from 11.30 and a couple of showers in the afternoon with some short sunny spells. |
| 9th | A cloudy/overcast day with just the briefest glimpse of sun in mid-morning. Sky clears a little in the evening. |
| 10th | Still low pressure dominates giving mainly a cloudy day with a rain shower early afternoon and a longer spell of rain showers during evening. |
| 11th | Some sunny spells in the morning and early afternoon. Series of thunderstorms with heavy rain pass over from 14.30 to 21.30. |
| 12th | A little rain overnight. A bright morning with some long sunny spells, cloudy by mid--afternoon. Light rain arrives around 17.00 and continues overnight.. |
| 13th | LP 1000 hPa North Wales. Rain and drizzle clears in the early hours. Mainly cloudy day with some sunny intervals, spots of rain briefly pm. |
| 14th | Yet more rain overnight. Bright morning with a few sunny intervals before showers again with one very heavy around 18.15. A cool and wet Saturday. |
| 15th | Light rain/drizzle early morning. Cloud slowly clears to give some sunny spells in the afternoon. |
| 16th | A drab, damp and gloomy day. Outbreaks of light rain/drizzle from midmorning to late afternoon. |
| 17th | A sunny start but becoming more cloudy as the day goes on. |
| 18th | Cloudy to start with a few sunny intervals in the morning and early afternoon. Overcast with rain from late afternoon. |
| 19th | A bright start with sunny periods early, becoming cloudier with brief sunny spells from mid-morning. |
| 20th | A bright start with sunny intervals, mainly cloudy in the afternoon but sunny spells later. |
| 21st | Sunny to start but clouding over by 09.00. Sunny intervals but mainly cloudy from mid afternoon. Brightening again towards evening. |
| 22nd | HP 1028 hPa English channel. A sunny day with just a brief cloudier spell in the morning. |
| 23rd | HP 1030 hPa Poland stretching west to 1025 hPa Azores. A rarity this summer: a day of uninterrupted sunshine. |
| 24th | Another day of uninterrupted sunshine. |
| 25th | A sunny morning, some patchy altocumulus in the afternoon interrupts the sunshine on and off for an hour. |
| 26th | Uninterrupted sunshine for nearly the whole day, a little hazy at times. |
| 27th | LP 1003 hPa NW of Scotland. Mainly cloudy but bright with some sunny spells. Rather hazy. Two or three rain showers after 21.30. |
| 28th | Cloudy morning, a little rain briefly around 09.00. Some sunny spells in the afternoon and evening. |
| 29th | Sunny morning but cloud increases after 09.00. Sunny spells with a thundery 10 minute downpour just after 17.00. |
| 30th | Sunny start but again cloud spreads from mid-morning. Some sunny spells through afternoon and early evening. |
| 31st | Mainly cloudy with a couple of brief outbreak of drizzle, a few sunny intervals in the afternoon and evening. |