Cloud Base Calculator
Estimate the height of convective cloud bases from surface temperature and dewpoint. The temperature-dewpoint spread determines where rising air reaches its dew point and clouds begin to form. This approximation applies to convective (cumulus) clouds only.
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Why This Matters to Pilots
Knowing the approximate cloud base helps VFR pilots determine if conditions are suitable for flight. A narrow temperature-dewpoint spread means clouds will form at lower altitudes, potentially creating MVFR or IFR conditions.
When the spread is less than 3°C, fog formation becomes likely, especially during cooling periods (evening, night, early morning). Monitor the closing spread trend to anticipate deteriorating conditions.
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Frequently Asked Questions
This calculator is for educational and planning purposes only. Always refer to your aircraft's POH/AFM, current NOTAMs, and official weather briefings. No calculator is a substitute for pilot-in-command judgment or CFI guidance.
Last reviewed: July 2026
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