Moisture also is what kills bees overwinter. They need ventilation and breezes. Also, they actually forage up to 4 miles away [http://en.wikipedia.org/wiki/Fo

Moisture also is what kills bees overwinter. They need ventilation and breezes. Also, they actually forage up to 4 miles away [http://en.wikipedia.org/wiki/Forage_(honey_bee) http://en.wikipedia.org/wiki/Forage_(honey_bee)]. Outside of that range, it is an energy negative (but some beekeepers will tell you that bees forage up to 7 miles away).