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ISA Temperature Lapse

Standard atmosphere temperature decreases about 2°C per 1000 ft up to the tropopause.

Formula

T=15−1.98(h1000)T = 15 - 1.98\left(\dfrac{h}{1000}\right)

Variables

TTemperature (°C)
hAltitude (ft)

Example

At 10000 ft: T ≈ 15 − 19.8 = −4.8°C

Did You Know?

The standard atmosphere assumes 15°C at sea level, dropping about 2°C per 1,000 feet of climb.

isaatmospheretemperaturelapse rate