dew point
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AI overview
The dew point is the temperature at which air becomes so saturated with water vapor that moisture begins to condense into liquid droplets. This matters because dew point helps predict when fog will form, how humid it will feel, and whether conditions favor rain or frost.
AI-generated from the Wikipedia summary — may contain errors.
Article
The dew point is the temperature that air, of a constant absolute humidity and pressure, must be cooled to in order for the relative humidity to rise to 100%. This temperature is a thermodynamic property that depends on the pressure and water content of the air. When the air at a temperature above the dew point is cooled, its moisture capacity is reduced, and when the temperature passes below the dew point water vapor will condense, or precipitate, to form liquid water. When this occurs through the air's contact with a colder surface, the precipitate on that surface is dew.
The dew point is affected by the air's absolute humidity. The more moisture the air contains, the higher its dew point.