In South Glos. today I spoke to a fellow windy in a balmy 4 degrees this morning (I could see the Severn Bridge and my side of the river it was grey but as it reached the Chepstow it turned white with ice!
) and we both agreed that with a bit of forethought and planning there is no reason not to work wfp in minus one or two daytime temperatures as long as you go steady, sweep away water and put salt/grit down.
It might mean slower work and working Saturdays like I plan to do tomoz - but it can be done.