Cloud Base

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The Cloud Base calculator computes the cloud base in feet above ground level (AGL) based on the difference between the ground temperature and the dew point.

INSTRUCTIONS: Choose units and enter the following:

(ST) Temperature at Ground Level
(DP) Dew Point

Cloud Base (CB): The calculator returns the distance above ground for the lowest level of clouds in feet. However, this can be automatically converted to any length unit (e.g. meters) via the pull-down menu.

The Math / Science

The formula to calculate cloud base based on surface temperature and dew point is:

CB = (ST - DP) • 1000 ft / 4.5 C°

where:

CB = Cloud Base - height of the lowest clouds about the ground
ST = Surface Temperature
DP = Dew Point Temperature

Note:This is for demonstration purposes and should not be used as actual flight data.

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