Canadian climate at 52N has not recorded a frost yet this winter!
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Visible frost wouldn't be due to temperature, so much as dewpoint. A 10C dewpoint, dropping to a -3C dewpoint, will have heavier frost than a 3C dewpoint dropping to -10C.
SE airflows here, don't produce much visible frost , even at -5C. Any other airflow, will produce visible frost, if temps are low enough.
Thats in your climate. Not here in Northern Ireland, we don't have those differences.
So what you're saying, is that your climate is warmer when nights are above freezing? That's to say, that temperatures at ground level will be colder here than NI, when air temperatures are above 0C.
I guess that's probably true actually. A consequence of clearer night skies and calmer conditions.