Toussaint's formula

Toussaint's formula

[tü′sanz ‚fȯr·myə·lə]
(meteorology)
A rule for the linear decrease of temperature with height in an atmosphere for which the temperature at mean sea level is 15°C, and given by the formula t = 15 - 0.0065 z, where t is the temperature in degrees Celsius, and z is the geometric height in meters above mean sea level.