On Friday, 26 March 2021 at 09:55:12 UTC, Bob Martin wrote:
When did England last get to the end of March without reaching 20 degrees?

Average March temperature, so far, is actually fairly close to normal across England. http://www.met.reading.ac.uk/~brugge/anomt.jpg

As for 20C, that's very unusual for March in Cornwall. Across the border in England it looks like 20C will be hit before the end of the month.
https://www.metoffice.gov.uk/weather...ate=2021-03-30

Graham
Penzance - So far mean temp +0.1C, rainfall 51% of the norm for the whole month. Sunshine at nearby Bosullow 81% of the months norm. It's been OK here.