I wonder what the record for two successive days in *any* month is -
based on a) lowest of the two days' maxima or b) the mean of the two
days' maxima?

Possibly the 9th and 10th of August, 2003?
--
John Hall


On 9 Aug 2003 the highest max attained was 36.4°C at Enfield (also
36.0°C at Kew, Greenwich and at Jersey), and of course on 10 August
38.1°C was reached at Kew, Royal Botanic Gardens (also 37.9°C at
Heathrow and at Aldenham School).

Although several heatwaves since and including 1868 have produced two
or more days above 35°C, this is the only occasion on the UK record
when two consecutive days have attained 36°C.

Stephen