Today's maximum temperature at my local site at Kew Gardens was 7.1C compared with the maxmum there 7 days ago on 30th March of 24.5C.
It started me wondering how often there has been a change in maximum temperture of 17.4 degrees C (downwards) in 7 days or less
The MetOffice MIDAS dataset now has daily maximum temperature data for Kew Gardens from 1882 up to 2020 so it is possible to find out - and it turns out that it is very rare
There have only been 5 occasions in 139 years where there has been a downward maximum shift of 17.4 degrees or more over that entire period for this particular site
in 2 days 25-27 July 2019 from 37.6C to 20.0C (down 17.6)
In 5 days 14-19 May 1891 from 24.4C to 6.1C (down 18.3)
In 5 days 24-29 Nov 1890 from 14.6C to -3.6C (down 18.2)
In 6 days 31 May - 6 Jun 1942 from 29.9C to 11.7C (down 18.2)
In 7 days 30 Mar - 6 Apr 2021 from 24.5C to 7.1C (down 17.4)
Edited by user
06 April 2021 21:02:20
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