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For every 10 degrees in temperature drop a tire will lose 1-2 pounds of air pressure. I'm sure footballs are the same. When the balls are checked inside the stadium prior to game time and it's 70 inside there will be a natural drop if the field is 35 degrees. Two balls set at identical temps inside prior to game time will be pretty different if the games are in Miami or New England in January. I'm sure that's taken into consideration. But who cares?
Since each team uses their own set of balls during the game who cares what the temperature is? It only affects the offense on the field not the other team.
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