according to the national weather service, which football game is considered to be the coldest game ever played?

The 1967 NFL Championship Game between the Dallas Cowboys and the Green Bay Packers.

Explanation:

The 1967 NFL Championship Game between the Dallas Cowboys and the Green Bay Packers, played on December 31 at Lambeau Field, is known as the Ice Bowl, arguably one of the greatest games in NFL history.

The game was played in brutal cold and windy conditions. The kickoff temperature in Green Bay was -13°F, with a wind chill of 36 below zero. Temperatures were so cold, in fact, that referees had to shout signals so that the metal whistles wouldn't stick to their lips. Even so, nearly 51,000 fans watched the coldest game in league annals.

Several players were treated for frostbite and a fan in the stands died of exposure to the cold.

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