The NFL is unusual because although football is a predominantly outdoor game, the season is played right through the absolute coldest time of the year.
As we have seen throughout the past few decades, weather conditions can make a huge difference in a game, with extreme cold completely changing strategies for both the home and away teams.
Because the coldest time of the year usually coincides with the NFL playoffs, those big games played in the brutal cold are often remembered for their combination of massive stakes and frigid temperatures.
Although there is no official record kept by the NFL of the coldest games, different websites, people and teams have kept their own history.
Here are the 10 coldest NFL games of all time.