On rainy days, the airflow rises, but on sunny days, the airflow falls. Why?

Because the airflow (that is, water vapor) rises to the sky and cools and condenses into small water droplets, a large number of water droplets gather together to form rain, and vice versa. The rise of airflow is not caused by cloudy days, but by the rise of airflow. In the same way, the decline of airflow causes sunny days. The reason why the temperature of the mountain is higher than that of the underground is mainly due to the inverse radiation of the atmosphere. When the sun's heat shines on the earth, a large part of the heat is absorbed by the ground, and then the ground forms a radiation source, releasing heat to the atmosphere, which will gradually decrease with the increase of height. As a result, an unattainable cold phenomenon has been formed. Of course, there are many other reasons, specific analysis of specific problems.