Second hottest day this month on Monday

As the mist and low cloud on Monday dissipated much earlier than on Sunday, with the sun breaking through after 10.30, the heat built higher again. The thermometer eventually peaked at 31.6C (10.6C above average) at 16.32, being the second hottest day this month after July 7th that reached 31.7C.

Monday night into Tuesday was again a very mild night with the thermometer not falling below 17.0C being 5.4C above the average and the second warmest night after 17.1C in the early hours of July 6th.

Tuesday saw very thin mist after dawn with the occasional glimpse of sunshine through broken, relatively high cloud unlike the thick, low cloud of the past two mornings.

The daily evaporation is the equivalent of over 3mm with the August total currently standing at 31mm against the minimal rainfall on the only rain day that totalled 1.2mm. The humid air has limited evaporation as normally between 4 and 5mm would escape into the atmosphere daily. During Monday again the humidity level dropped to 60% for most of the day when under such strong sunshine and high temperatures that would normally drop to around 30%.

Update on Tuesday at 16.00: thermometer just reached 34.0C being the hottest day since July 2006.

at 17.15: maximum of 34.1C reached at 16.27. This was the hottest day since the record maximum of 34.9C was recorded on 19th July 2006. The station opened in 1984.

Hot after cloudy morning on Sunday

Sunday morning was memorable for the low cloud and mist that took until 11.30 for the sun to break through. Thereafter the thermometer steadily rose to a maximum of 29.0C at 18.01, which was 8C above the 36-year average.

Sunday was another dry day but the air was humid. Usually in hot, sunny weather the humidity level drops to 30% or less but yesterday it hovered around 60% all day.

We are now seven weeks after midsummer so it is not surprising to find over the past few days that the UV level now only reaches the ‘High’ category around midday.

A very mild night followed with the temperature still round 20C at midnight but steadily fell in the early hours to a minimum of 16.8C being 5.2C above average.

Monday morning was almost a repeat of Sunday with low cloud draping the Marlborough Downs and Savernake Forest limiting visibility to 1100m. By 08.00 the visibility had improved markedly as the cloud thinned and lifted. The wind continues to be brisk from the north east.

Update on Monday at 18.30: the thermometer rose to a maximum of 31.6C at 16.32, which was 10.6C above average

Cooling north easterly modified heat on Saturday

Although we had 11.3 hours of sunshine on Saturday the fresh breeze from the north east and variable thin high cloud meant a slightly less hot day than on Friday with a maximum of 28.4C. This peak was 7.4C above the 36-year average. We haven’t experienced a north easterly wind for almost a month, which was due to a centre of high pressure off the Scottish east coast circulating clockwise and a small depression over northwest France spinning anticlockwise, as they do. The result was a brisk breeze all day with a maximum gust of 15mph that continued throughout the past night.

It was another dry day with the UV only reaching the ‘High’ level.

The north easterly breeze dragged cloud in from the North Sea overnight that produced complete cover on Sunday morning so a sunless start to the day unlike previous mornings. The minimum overnight was 15.3C being 3.8C above average.

Update on Sunday at 18.15: after a cloudy start to the day the sun began to break through after 11.30 and the thermometer steadily rose to a maximum of 29.0C at 18.01.

Heat intensifies

Friday saw the thermometer rise to 31.7C at 13.34 making it the hottest August day since the August record set for this station on 1st August 1995 when 31.8C was recorded. Just after 13.15 cloud began to drift in from the west when the temperature began to slowly fall away. This peak was 10.7C above the 36-year average and the hottest day since 31st July when 32.9C was recorded. The heat has been brought from North Africa on a plume 700 miles wide.

Fortunately the clearer skies overnight meant that the thermometer drifted downwards to reach a minimum of 15.7C at 05.53 allowing some of the heat to dissipate before the sun got to work again on Saturday. There was a little radiation mist in the River Og valley after dawn that quickly evaporated.

A large bank of cloud initially obscured the sun after dawn but at 06.25 the sun rose above the back edge of the cloud bank and by 08.00, when records were taken, the thermometer read 19.8C indicating another hot day ahead. The soil is now holding on to much of the daytime heat with the ground thermometer at a depth of 5cm reading 21.1C at 08.00.

Update on Saturday at 16.42: brisk north easterly breeze and variable high cloud limited peak temperature to 29.0C at 16.40, down 2.8C on Friday’s maximum.

Heat builds!

The southerly air brought the forecast hotter weather as the thermometer soared to 25.7C, which was 4.7C above the 36-year average. The morning was dogged by light drizzle that was not measurable.

Under clear skies the temperature dropped away to 11.0C overnight, just 0.5C below average, with fog forming in the early hours limiting visibility to 600m but by 07.30 on Friday it had completely evaporated under the influence of strong sunshine.

Update on Friday at 18.15: thermometer soared to 31.7C at 13.35 before cloud built up with spots of rain just before and after 18.00.