If the monthly mean of average daily temperature for the hottest month of the year is 25°C and the monthly mean of the maximum daily temperature of the same month of the year is 46°C, the airport reference temperature is A. 32°C B. 35.5°C C. 48°C D. 25°C

The correct answer is D. 25°C.

The airport reference temperature is the average daily temperature for the hottest month of the year. In this case, the monthly mean of average daily temperature for the hottest month of the year is 25°C. Therefore, the airport reference temperature is 25°C.

Option A is incorrect because it is the monthly mean of the maximum daily temperature of the same month of the year, which is not the same as the airport reference temperature.

Option B is incorrect because it is the average of the monthly mean of average daily temperature and the monthly mean of the maximum daily temperature of the same month of the year. However, the airport reference temperature is not the average of these two values.

Option C is incorrect because it is the monthly mean of the maximum daily temperature of the same month of the year, which is not the same as the airport reference temperature.