I would say that the South East corner of the UK is generally the warmest, attracting air of the continent. Howvere in winter if the air is a NE or E flow these areas are often the coldest. From April - October the Se is generaly warmer than the midlands and north by between 2-8 celcius.
The excetions to this are when the north is sunnier and the south wetter or when the airflow is more coller from thr East leaving the midlands warmer, as in the last weekend of May 2009.
SF
My guess would be Torquay, Devon; due to the proximity of the warm gulfstream current. There are palm trees in Torquay.
The warmest place in the british isles is Jersey in the Channel Islands.
There is nowhere in Britain that could be classed as warm but the mildest climate is probably in the Scilly Isles which are affected by the Gulf Stream.
Scilly Isles
Typically the south, Bavaria, is the warmest.
i think Athens is the warmest place in Greece but im not sure
The Antarctica Peninsula is the warmest part of the continent.
The Okinawa Prefecture is the warmest place in Japan. It is the southernmost Japanese Prefecture.
depending on which was the wind is blowing, Pembrey Sands in Carmarthenshire can be both the warmest and coldest place in wales :)
changsha
Miami
Pasco
Maastricht
Kota ( Rajasthan)
Mohenjo-Daro
Kota ( Rajasthan)