Originally Posted by blueblade:
“Nor, here in the UK, have we got anywhere near the September maximum of 35.6C reached at Doncaster on 2nd September 1906. In fact we haven't had a 32C in September since 1949.
The latest date on which 32C has been reached was on 19th September 1926 - 32.2 at Camden. Nowhere near that in recent decades.”
The June record nearly went last year though, with Heathrow surpassing the Southampton record for June of 35.6 ... on July 1st! There's a lot of luck involved in getting high temperature records late in May or June, or early in September or October but one by one, slowly but surely, the records will tumble.
Part of the problem is the use of old style passive louvred wooden screens in the last Century, these (including Stevenson screens) are known to produce artificially high air temperatures by up to 2 degrees C or so, sometimes more, in conditions of hot sunny weather with light winds. Many of these worldwide are slowly being replaced by better screen designs such as, for example, aspirated automatic weather station screens and even passive plastic screens are a bit 'better', so records aren't always directly comparable with the olden days.