Air min in the Chipstead Valley last night 0.0C which does not constitute an
air frost as it has to be -0.1C but nonetheless still a chill in the air at
dawn. In Coulsdon the min was 2.9C. Usually there is more of a difference
but there was a noticeable wind until quite late and thus air in valley was
stirred up somewhat.
With regards to Bjorn Sorheim's post re cold air moving south over Europe it
has been snowing in the area of Austria I monitor near Lunz where is a
remarkable frost hollow it has been snowing most of the day at a height of
1600 metres. It was around minus 3C at midday. A real winter wonderland.
Talking of winter wonderland I wonder if the person who posted an excellent
picture of snow drifts on a lonely road at the end of February this year on
the Yorkshire Moors could contact me. It has a tree on the left hand side of
the road.

Ian Currie--Coulsdon and Chipstead Valley
www.frostedearth.com