In article ,
Ron Button writes:
Good evening,with the sky now full of St Cu here in SouthEast England,and a
wind coming from Holland with temps around -1C plus blowing over a sea
between 7-10C, how pray will we get 'a penetrating frost' tonight ?

With enough wind, even a temperature of -1 or -2 can give a penetrating
frost. And with only a short sea track, the air shouldn't warm up that
much in its journey from Holland.

http://www.metoffice.gov.uk/weather/...t_weather.html

shows that at 8pm many places in the SE were already within a degree of
freezing, with a moderate Easterly breeze.
--
John Hall
"Honest criticism is hard to take,
particularly from a relative, a friend,
an acquaintance, or a stranger." Franklin P Jones