If the temperature at sea level were 23C what would the air temperature be at a height of 2 kilometers under average conditions?

Under average conditions, the temperature typically decreases with altitude in the troposphere at a rate of about 6.5°C for every kilometer. Therefore, if the sea level temperature is 23°C, at a height of 2 kilometers, the temperature would be approximately 23°C - (6.5°C x 2) = 10°C. Thus, the air temperature at 2 kilometers would be around 10°C.