How to forecast the weather outdoors?

The skills of outdoor weather forecast are as follows:

1, the distant mountains are visible and the weather is fine; The mountains are blurred and it is raining. Because the air is dry and the weather is sunny, you can clearly see the mountains in the distance.

You can clearly hear the sound of the train, it's going to rain. When the weather is gloomy, the temperature difference between day and night becomes smaller, and the sound travels far easily.

It may rain when you see a cat washing its face. Cats wash their faces with their front feet, because when it rains, the humidity increases and fleas move on cats.

Frogs keep barking, it's going to rain. Frogs have thin skin and can feel the change of humidity, so if they bark more fiercely than usual, it means that the humidity in the air is high and it is going to rain.