The surface temperature is 20 °C. Using the standard lapse rate, what temperature would you expect at 3,000 ft AGL?

Giải thích

The standard lapse rate is a decrease of about 2 °C for every 1,000 ft of altitude gain, so 3,000 ft produces roughly a 6 °C drop and 20 minus 6 leaves about 14 °C. Answering 17 °C applies only 1 °C per 1,000 ft, and 11 °C applies 3 °C per 1,000 ft. Temperature does not stay constant with height unless an inversion is present, which is an exception rather than the standard model.