A sunny day means there is not much cloud cover. Generally speaking, it is easy to clear up in the high-pressure area, because the airflow in the high-pressure area is falling, and it rarely turns into clouds in the sky to rain. The professional view is that the sky above the surface is controlled by the upper trough or subtropical high, while the amateur view is that the vertical mobility of air is weak, there are few clouds above, and the atmospheric transmittance is high.
Sunny days can make people feel happy. It is a good way to keep in good health to bask in the sun for 20 minutes before 10 or after 5 pm every morning. Moreover, the scenery on sunny days is also beautiful. The blue sky and flaming sunset glow make people feel happy and healthy after a busy day.