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The car is cold; icy cold. You are in the driver's seat, facing forward, and breathing, and your exhaled breath contains about 1% water vapor. Your breath hits the inside of the windshield. The vapor condenses on the cold windshield and freezes. If you were in the back seat or passenger seats facing sideways, those windows might also freeze.

However, the windshield defroster should, within a couple of moments, clear up the windows.

If you're referring to the outside windows, the windshield is tilted and water vapor can condense and freeze on it as the vapor falls. Your side windows are vertical, or nearly so, and not much water lands on it. Rear windows are tilted, but generally less than the windshield, so they don't frost up as badly.

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Q: Is there anyone out there that can explain why the windshield of a car is always the first ( and often only) vehicle window to frost up and the last window that wants to unfrost?
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