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 determine the approximate cloud base (AGL) when automated weather is unreliable using a simple mathematical formula.
The formula is: (Surface Temperature in Fahrenheit - Dew Point in Fahrenheit) / 4.4 × 1,000 feet.
Pilots should be cautious as cloud bases can drop rapidly and fog can form when the temperature and dew point converge, especially later in the day.

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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?