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Cause of dew: You have a local surface that is below the dewpoint. It has gotten enough colder than the air, that water condenses on it. Dew is heavy on clear nights (more surface radiation cool...
Cause of dew: You have a local surface that is below the dewpoint. It has gotten enough colder than the air, that water condenses on it. Dew is heavy on clear nights (more surface radiation cool...