Screened or un-screened bottom boards during winter in the P.N.W.? Upper entrance or not?
After researching online I'd planned to leave my screened bottoms open through winter here in the Pacific North West, and not use an upper entrance. However, I'm being told that upper entrances are necessary and I should cover my screens. Will that really improve a hive's chances of survival? I was more concerned about moisture buildup than cold temperatures, the absolute coldest it gets here is the mid-teens during the evenings for a few days here and there. All my hives are double deeps and are full of honey stores, plus winter patties on top just in case. I've also been diligent about my mite treatments. I was not planning to wrap or insulate them either.
Feedback would be greatly appreciated.
Edit: It is zone 8a or 8b.