What is the temperature lapse rate in Celsius per 1000 feet?

The temperature lapse rate refers to the rate at which temperature decreases with an increase in altitude in the atmosphere, specifically in the troposphere where most weather occurs. The standard lapse rate is approximately 6.5°C per 1000 meters, which converts to about 3.3°C per 1000 feet.

When looking at the options provided, 2°C per 1000 feet is the closest approximation to the average lapse rate in a practical sense, fitting within the context of typical atmospheric conditions. This figure provides an easy way for pilots and meteorologists to understand how temperature might change with altitude, particularly when flying, as it offers a practical guideline rather than an exact value.

While 3°C per 1000 feet is a common figure in certain contexts, it overstates the lap rate for standard atmospheric conditions. The other choices do not accurately reflect commonly accepted lapse rates, making the choice of 2°C per 1000 feet the most suitable answer for those involved in practical weather applications.