A rising fog indicates fair weather. If the fog settles down, expect stormy weather.
Seaward and Landward.
Fog from seaward, fair weather; fog from landward, rain. (New England.)
Summer Fog.
A summer fog is a good indication of fair weather.
Southerly Wind.
In summer, when fog comes with a southerly wind it indicates warm weather; when it comes with a northerly wind it is a sign of heavy rain.
Weather.
When the mist is on the hill,
Then good weather it doth spoil.