From an old copy of the Guinness Book of Records dated 1978 . It quotes the example of 29th August 1936, when the range was 28.3*C at Rickmansworth, Herts, when the temperature rose from a morning minimum of 1.1*C to 29.4*C in 9 hours. This site is a renowned frost hollow, so its daily range is likely to be greater than other sites in the same general area.
It is Rickmansworth. In a frost hollow caused by a railway embankment - preventing the natural drainage of cold air from a valley. As far as I know Rickmansworth (at least this part of it) is the only place in England to have recorded frost in every month of the year. Over to you.
I should have been more careful with the wording of that question - had I known that Sting had done a cover version, I would have asked who sang the original version? I would have twigged too to the fact that Sting picked the song up from Police's guitarist Andy Summers, who was guitarist for the band who originally released the song a decade previously - Dantalion's Chariot. Over to you..
OK a local history question - "What was the name of the maternity hospital in Hemel that was knocked down for houses a few years ago?"