Early forecasts from both the major forecast models indicate near, at, or below freezing temperatures at gametime next week. The following maps are for 0 zulu time on Sunday, December 18th (approximately 7 PM ET on Saturday, December 17th, which is an hour before kickoff)
American GFS suggests scattered snow showers with temperatures hovering right around the freezing line (lower 30s)
European is colder (middle 20s) with lake-effect driven snow potential.
Obviously this is 6 days away and forecasts could change but it's what we all expected - it's cold and snowy in Buffalo in December.