Final answer:
The temperature lapse rate below the tropopause is approximately 2°C per 1000 feet. This is a standardized average that can vary with different atmospheric conditions.
Step-by-step explanation:
The temperature lapse rate below the tropopause is generally accepted to be around 6.5 K or degrees Celsius per 1000 meters. However, when converting this value to feet, we use the conversion of 1 meter to approximately 3.281 feet. This means that the lapse rate is closer to 2°C per 1000 ft. It is important to note that this is an average value, which can vary depending on atmospheric conditions, such as the presence of a temperature inversion or other meteorological phenomena.