Apryl, FNF,
How cold are you guys! Taters!
We been down in the - just a couple times so far.
I would be keeping an eye on the relative humidity and comparing it to the in the coop humidity.
Nothing you can do if the outside humidity is high. If its say 50% outside the coop and 70% in the coop the ventilation may need adjusted, bedding changed that sort of thing.
If you have a slanted one direction roof adding holes on the low side and the high side causes more air to flow up and out taking the wet with it. It works much better then large vents on side walls directly across from each other.
Ya'll probably already knew that but I toss it out there in case other (lurkers) don't.