"Mike Tullett" wrote in message ...
No. For you to record an air frost, it has to be below zero.
It's a shame that digital thermometers don't display the (probably
mathematically incorrect) -0.0C as there's a tiny window of negative numbers
which will round up to 0.0C rather than down to -0.1C. (Technically anything
from -0.00...1 to -0.0499... - okay, not exactly a great range but it still
means once in a blue moon a frost will have been missed due to rounding).