In message , Bernard Burton
writes
"Keith (Southend)" wrote in message
...
This November I only had two 5 minute logs (10 minutes) of 0.0°C, is this
classed as an air frost or should it be -0.1°C?

My thinking is not, so no air frost reported for me for the whole month.

Keith (Southend)

Yes Keith, temperature needs to be below zero to warrant a frost


I think the argument is that 0.0C is defined as the melting point of ice
rather than the freezing point of water.
--
John Hall "Hard work often pays off after time, but laziness always
pays off now." Anon