Why are there stars at night, and the next day will be fine?

"Not necessarily. The stars cannot reflect anything. Of course, if the view is really good, the weather may still be good. If there are not many stars or it feels dark, the water vapor in the air may be heavy (cloudy or foggy), and the next day may be cloudy or cloudy.

It would be best if we could see the moon at night. The moon is clear and there is no fuzzy white light around it, which means it is likely to be sunny the next day. There is an obvious halo around the moon, and it may be cloudy, cloudy or even rainy the next day, depending on what kind of halo it is, fuzzy or slightly colored (estimated to be sunlight refraction? It may rain (I can't describe that). Of course, it is not enough to rely on the information given to you by the sky. To know whether the weather is good or bad may depend on whether the air around you is humid or whether there are many clouds on the horizon.

According to my observation for only five years, it can't be said to be an experience. I don't know much about meteorology and astronomy I can only watch.

It is good to observe more, and gradually you will find some rules. "