A cloudy day is, usually, more windy than a clear one. That is true. But I have been at sea and experienced a full hurricane force wind (above 64 knots) in a blue sky. read more
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If it is windy then the air just above the ground keeps on getting mixed with the air higher up and the air does not cooled to the dew point and no dew forms. Thus to form dew you need a still clear night. read more