Still warm-air layer can lie under cool air {air inversion}|.
Humid air can cool to temperature {dew point} at which water condenses.
Water can condense on ground {dew}|, instead of in air, when ground is cooler than air, often after midnight on still autumn nights.
In air inversion, ground can lose heat by radiation at night and condense water {fog}| from warm air. Warm air cooled by rain can condense water and make fog.
Dew {frost}| can freeze.
Frost {hoarfrost}| can form on artificial surfaces.
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Date Modified: 2022.0225