League has no set temperature at which it's too cold to play - NBC Sports
Packers-49ers playoff game will be among coldest in NFL history
Remembering the NFL's Worst Weather Games – NBC Connecticut
NFL weather games: Football played in the elements
Brrr-owns, Saints set to battle each other, frigid elements
NFL weather games: Football played in the elements
NFL weather games: Football played in the elements
Brrr-owns, Saints set to battle each other, frigid elements
John M. Crisp: Maybe some elements of football are best left unexamined.
How cold will it be? Possibly the coldest Packers-Vikings game ever at Lambeau Field
NFL weather games: Football played in the elements
NFL weather games: Football played in the elements