1. The distant mountains are visible and the sky is clear; the nearby mountains are blurred and the sky is rainy. Because the air is dry and the weather is clear, the distant mountains can only be seen clearly.
2. The sound of the train can be clearly heard and it will rain. When the weather is gloomy, the temperature difference between day and night becomes smaller, and the sound is easy to travel far.
3. It may rain if you see the cat washing her face. The action of the cat washing its face with its front feet is because the humidity will increase when it is about to rain, and the fleas will become active on the cat.
4. Frogs keep chirping and it will rain. Frogs have thin skin and can sense changes in humidity, so if they bark more intensely than usual, it means that there is a lot of humidity in the air and it will rain.
5. If you see water droplets on the spider web in the morning, the sky will be clear. When the weather is good, the temperature difference between day and night will become larger, and the water vapor in the cold air will become small water droplets.
6. When the fish jumps out of the water, it will rain. The news that the weather has turned bad in the distance is quickly transmitted to the water, and the fish jumps in surprise.
7. Swallows fly low and it will rain. When the weather turns bad, insects fly mostly on the ground. Swallows want to eat insects, so they fly low.
8. Facing the coast, when there is thunder in winter and the northwest monsoon blows, it will rain heavily.
9, earthworms drill out of the ground, it will rain. When the weather turns bad, the humidity increases, the ground warms, and earthworms burrow out of the ground.
10. When the frost is irradiated by the rising sun, it will give off a splendid brilliance and it will be sunny. The cause of frost is that the night is cold, and the temperature difference is large during the day. The temperature during the day is high and the sky is sunny.