How Do You Track Altitude of Cloud Bases?

There’s a simple math formula for pilots to estimate that height in poor weather.

Meg Godlewski

Wednesday, February 25, 2026 at 09:00 AM ET

Verified

Edited By:

Travis Tingle

There’s a basic calculation pilots can use to avoid cloud bases. [Credit: FLYING Archive]

Key Takeaways:

Student pilots can estimate cloud base without relying on unreliable automated weather machines by using a simple mathematical formula.
The formula is: (Surface Temperature in Fahrenheit - Dew Point in Fahrenheit) / 4.4 x 1,000, which provides the cloud base in feet above ground level (AGL).
It's important to monitor the temperature-dew point spread, as a narrowing gap can indicate rapidly dropping clouds or the formation of fog.

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Question: I am a student pilot and have learned that the airport’s automated weather machine is prone to malfunctioning and unreliable, so we’ve been taught not to trust it. The winter is all low clouds, and sometimes the pattern is a little iffy. Is there an easy way to determine the base of the clouds beyond taking off and seeing if you have the room to fly the pattern?