Variprime and outside air temps
Steve:
Living in NE Wisconsin I can chime in here with some experience. I have primed RV parts all winter long with no trouble. I set up a sawhorse outside in the driveway and hit the parts out there. Afterward I take the primed parts into the heated garage and they dry up just fine. Before I had the heated garage (AKA airplane assembly facility) I took the parts down into the basement. Made the basement smell for a day, but the wife didn't divorce me over it.
You will find that the flash time is extended in the cold, but it really isn't a problem.
Regards,