It has always been accepted as fact in my circles that cold does not affect whitetails. Only deep snow or ice and/or crusted deep snow adversely affects them. As long as they can stay mobile and feed easily, no temperature lows known to man will impact them. Food is their only concern. As long as they can get to it, they are good. Let's hope that the snow we have doesn't melt and then refreeze as ice, or that we get a deep accumulation. In extended durations of cold, any snow we get stays, so deep accumulations can result.