I was there. I remember it being cold. I was young though.
But the coldest game I was ever at was a game against (I believe) the 49ers in the 2000s where it was light rain all game, cold, the Bills sucked, The Lossman came in the game just to do something stupid, and someone stole my beers.
Temperature wise it certainly wasn't the coldest. But it was the coldest I've ever been at the stadium.
Miserable game.
Go BIlls lol.
FAKE EDIT: this one: https://www.footballdb.com/games/boxscore.html?gid=2008113005