Last night saw some unusually cold August night-time temperatures across parts of the UK, with some observation sites hitting record lows.
Among those stations seeing their coldest recorded August temperature were:
Braemar No 2, Aberdeenshire: -2.4 °C
Aviemore, Highlands: -1.8 °C
Redesdale Camp, Northumberland: -0.7 °C
Bainbridge, North Yorkshire: 0.5 °C
Benson, Oxfordshire: 2.1 °C
Bradford, West Yorkshire: 2.8 °C
Observation sites have operated for differing amounts of time, so some records are more significant than others. Out of the new records, Bradford has the longest historical dataset – going back to 1908.
It’s worth noting that none of these break the all-time record low UK temperature for August, which is -4.5 °C recorded at Lagganlia, in Inverness-shire on 21 August 1973.
Why was it so cold in places?
Last night saw northerly winds drag cold air from quite a long way north over the UK. This air was also dry, which meant there was very little moisture to help retain heat from the day.
This, combined with clear skies caused by the high pressure sitting over the country, meant all the heat radiated into the sky – leaving very cold temperatures for the time of year.
Once in a blue moon?
While UK weather records such as this aren’t broken once in a blue moon (we’ve had many broken already this year), this set does more or less coincide with the astronomical phenomenon.
A blue moon occurs when there are two full moons in one month – which is perhaps not as rare as the saying may have us believe. There was a full moon at the start of August and now a full moon is due tonight.
You can read more about this in articles online, such as this one at earthsky.org