Parked on a shaded street, so I’m guessing it’s not the sun? Stumped though.
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Everything around your car radiates heat, warming what is pointed at those things. The side windows are pointed at warm buildings or other objects and warmed by their heat radiation. The windshields develop frost because they are pointed at the one thing that isn’t radiating heat: the sky. This allows the temperature of the windshields to drop below freezing.
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