What is temperature lapse rate?

The lapse rate is the change in temperature as height increases.

The standard lapse rate is 1.98 Celsius decrease (3.57 Fahrenheit) per 1,000 feet.  This change is fairly constant until reaching the tropopause.  At the tropopause, the lapse rate remains constant or may increase slightly.

Reference(s):

FAA AC-00-6B Aviation Weather pg. 2-11

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