Well in those temps, i'm thinking the bucks are fine? When it gets -0 i know they hunker down a bit, not much tho if it's during the Rut. They are moving big time and breeding in Wisconsin, heck, i've heard them breeding by my stand, and it's been real warm here. When it's the RUT, it don't matter what the weather does, from the key deer in Florida to the Alberta White-Tail, the rut happens, get out there and hunt bud.