conclusion:
37.2 in my garden, North Cardiff.
(proper temperature measruing equipment as stolen by my dad from his work.)
( Sir Sand Goblin i can explain, see, it used to be milk., Sat 9 Aug 2003, 17:26, archived)

35C
Says my outdoor digital thermometer, which is currently (just) in the shade.

Edit: Oh, I'm in Oxford. :P
( Leo Panthera, Sat 9 Aug 2003, 17:28, archived)