Why do the more stars you see at night, the hotter the weather the next day?

At night, the number of stars is closely related to the sky conditions at that time. When there are clouds in the sky, because the stars are covered by clouds; At the same time, starlight will be reflected and absorbed by water droplets, so from the ground, there are few stars and the luminosity is weak. If there are no clouds in the sky and there is less water vapor in the air, there will be many stars from the ground.

In summer, when some areas are shrouded by subtropical high system, the air in these areas mostly sinks. During the sinking process, the air pressure gradually decreased, and the air layer became drier, resulting in cloudless weather. After nightfall, the solar radiation heat source is interrupted, the ground temperature drops rapidly, the evaporation of water vapor weakens, the temperature in the lower layer drops, the gas layer becomes drier and more stable, and people will see more stars.

Therefore, people can judge that the local area is being shrouded by subtropical high from the fact that there are more stars in summer nights. Because under this pressure, some parts of the ground are cloudy and sunny, and solar energy fully irradiates the ground during the day, which makes the ground heat up strongly. Moreover, under this high pressure, the weather is often relatively stable and rarely changes. Therefore, we can further judge that the weather will be hotter the next day from the phenomenon of many stars in summer. This is the truth of the words "The sky is full of stars, and it will be sunny tomorrow" and "The stars are bright at night, but it will be sunny in the Ming Dynasty".