"tony_powell" wrote in message news:B5XWe.1161
Hi, Seeing your remark about ice on the cars, the same was true here this
morning. It seemed strange though as my minimum recorded temperature was
3.9c (taking the lowest reading of 3 outdoor boxed sensors) Any ideas, how
high does the temperature need to rise, in order for ice not to form on
cars
etc. There is obviously several factors but I would interested to know as
this occurence has happened several times in the past.

Tony,
I have known ice (ground frost) with an air minimum of above 3c, but not
above 4c so you are at the high end!

It depends on radiation loss, humidity and wind etc as you probably know.

Phil