I'm in Upstate NY, where the winters can get pretty cold. Below zero for a couple of weeks at a time is not uncommon. The last two winters have been especially rough, and the upcoming one may be as well.
So, do you use a solid or screened board through the winter?
I know how important ventilation is. On the other hand, I would think that screened board would be clogged by snow anyway for at least part of the winter.