Because football is less affected by torrential weather than baseball. While the passing and kicking game is *impacted* by heavy rain, you can still play a somewhat functional game of football no matter how heavy the rain is. Baseball, however, is simply not playable if rain is too heavy. For one, pitchers can’t grip the ball, and fly balls can’t carry at all. Puddles in the infield make grounders unplayable. There is really no way to adjust for these things.
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