Business Aviation Weather: International Standard Atmosphere – How It Affects Flight
Universal Weather
JULY 31, 2025
The ISA uses a standard lapse rate of: 2°C per 1,000 ft (or 6.5°C In reality, lapse rates can vary: Dry adiabatic lapse rate : ~5.5°F C per 1,000 m) up to 36,000 ft Above 36,000 ft, ISA assumes the temperature remains constant.
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