What is the temperature lapse rate typically observed in aviation?

The correct answer, reflecting the typical temperature lapse rate observed in aviation, is 2 degrees Celsius per 1000 feet. This value describes the rate at which temperature decreases with an increase in altitude in the troposphere, the lowest layer of the atmosphere where most weather events occur.

As an aircraft ascends, the surrounding air expands and cools, resulting in this general trend of temperature decrease. This lapse rate is important for pilots and aviation professionals to understand as it directly impacts flight performance, aircraft systems, and weather conditions encountered during operation.

In contrast, the other options indicate rates that do not align with the standard lapse rate used in aviation. Understanding these values helps pilots make informed decisions regarding altitude changes and their potential effects on aircraft performance and safety.