"Philip Eden" philipATweatherHYPHENukDOTcom wrote:

Nothing above 20ºC at a standard site (i.e. not counting rooftops)
in the UK in April 2000. In 1970 and 1941 the UK maximum
for the month was 18.3ºC ... can't be sure this is the record, though.

Record could well be 1903 when the month's maximum was 17.2ºC
at Cambridge on the 29th.

Philip Eden