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when there is a little bit of water in the air.
Dew won't form if there is no atmospheric moisture present (humidity of 0%), or if temperature is above the dew point for a given relatively humidity.

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14y ago

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More answers

Dew does not form when the air is very dry, with low humidity levels. In such conditions, there is not enough moisture in the air for dew to condense on surfaces. Dew also does not form in windy conditions, as it hinders the formation of a layer of still, cool air near the ground that is necessary for dew to develop.

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9mo ago
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Q: When does dew not form?
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