On Sun, 18 Oct 2009 11:14:48 +0100, Graham P Davis wrote in


Hugh Newbury wrote:

Will Hand wrote:

Min +1.3C in Haytor even (and we are not prone to radiation frost being
elevated).

Will, could you please explain this for beginners like me.


The ground cools through radiation as elsewhere and thus the air in contact
with the ground is cooled. However, the cold air then drains off the hill.

And it's in these conditions that valley bottoms can be several degrees
colder than hill/mountain tops at night.

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Mike Tullett - Coleraine 55.13°N 6.69°W posted 10/18/2009 10:39:07 AM GMT