"Hugh Newbury" wrote in message ...

The BBC Bristol weatherman said last night that the lowest temperature
this morning would not be just before dawn, but just after. He didn't
have time to explain why, so could someone here please help me see why
this should be.

Hi, Hugh,
It's all about balance of radiation. When the incoming short wave from the
sun becomes greater than the outgoing long wave from the ground,
temperatures will rise. Normally, under clear skies and light wind it's
about 30 minutes after sunrise. Explains why hoar frost remains in the shade
all day and sun doesn't melt snow that much if skies are clear.
HTH
Best wishes,
Ken