Quote:
Originally Posted by Billfitz
As to the source of the moisture for the OP, in the winter the dew point and relative humidity are very low, so that removes condensation as a source. The remaining possibilities are a leak and the breath of passengers. If moisture appears when there's no one in the car that narrows it down to a leak.
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In the Winter with low temps, the actual name changes to frost point, but no virtually no one uses the term or knows what it is.