Dew Point
Dew Point
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19.Jun.2022
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SKYbrary Aviation Safety. (June 19, 2022). Dew Point.
Retrieved June 3, 2026
from https://skybrary.aero/articles/dew-point
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Definition
The Dew Point is the air temperature at which a sample of air would reach 100% humidity based upon its current degree of saturation.
Description
Once the relative humidity of a mass of air becomes 100%, then if the temperature falls it cannot hold all of the water vapour within it. The excess water vapour will then condense into cloud or fog or, if in contact with objects on or near the ground, will form dew or hoar frost.
When observing successive weather reports (METARs), a reducing gap between the actual temperature and the Dew Point temperature gives an indication of impending low visibility conditions and the posibility of fog.
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