Weather

Tools for understanding aviation weather: flight categories, cloud bases, METAR decoding, and weather analysis.

Flight Category Checker

Determine VFR, MVFR, IFR, or LIFR from ceiling and visibility.

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Cloud Base Calculator

Estimate convective cloud base from temperature and dewpoint.

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METAR Decoder

Decode METAR weather reports into plain English.

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Relative Humidity Calculator

Calculate relative humidity and temperature-dewpoint spread, with a carburetor icing risk indicator from FAA AC 61-23C.

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Freezing Level Calculator

Estimate the altitude where the temperature reaches 0 degC, in AGL and MSL, from surface conditions and a lapse rate.

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Precipitation Type Estimator

Estimate likely precipitation type (rain, snow, ice pellets, or freezing rain) from the vertical temperature profile. Educational estimator, not a forecast.

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