Answer:
3.5 °F/1000 ft
Explanation:
The "normal lapse rate" is the average rate at which normal air temperature decreases with increasing altitude. It is on the order of 3.5 °F per 1000 ft or 6.5 °C per km.
__
The actual lapse rate depends on a number of factors, including radiation, convection, and condensation. An "inversion" is characterized by increasing temperature with altitude.
