What is the average lapse rate in degrees Fahrenheit per 1,000 feet?

The average lapse rate refers to the rate at which temperature decreases with an increase in altitude in the atmosphere. In the standard atmosphere, the average lapse rate is approximately 3.5 degrees Fahrenheit per 1,000 feet. This value provides a useful benchmark for pilots and air traffic controllers in understanding how temperature variations with altitude can affect aircraft performance and weather phenomena.

Understanding the lapse rate is essential for making decisions related to aircraft operations, as it helps in anticipating changes in air density, performance characteristics, and potential weather changes. In contrast, the other options reflect rates that are either too low or too high, which would not align with the established standard of 3.5 degrees Fahrenheit. Thus, recognizing this lapse rate is critical for accurate flight planning and safety in aviation operations.