Observe on what day in August the first heavy fog occurs, and you may expect a hard frost on the same day in October.
April Fog.
Fog in April foretells a failure of the wheat crop next year. (Alabama.)
If the first three days of April be foggy, there will be a flood in June. (English.)
Continued Fog.
If there be continued fog, expect frost.
Dew.
When the dew is seen shining on the leaves, the mist rolled down from the mountain last night. (Zuñi Indians.)
Damp Fog.
If there be a damp fog or mist, accompanied by wind, expect rain.