Fog
When the temperature of air close to the ground falls low enough, dew will form. If a larger layer of air is cooled, for example at night, the condensation of excess moisture in the air will form a mist of tiny water droplets known as fog.
Fog is common in the autumn and winter in Britain when the air temperature falls low enough at night for it to form. It usually forms when there is little or no wind to disturb it. It is also more common in hollows and valleys, where the air tends to be a little colder because it is heavier and sinks down into these places. Fog is least likely on hilltops, unless low clouds have descended to cover them.
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