1. The distant mountains are visible and the sky is clear. Because the air is dry and the weather is clear, the distant mountains can be seen clearly. 2. You can hear the train very clearly. It's going to rain. When the weather is overcast, the temperature difference between day and night becomes smaller, and the sound can be easily transmitted far away. 3. It might rain if you see a cat washing its face. The act of a cat washing its face with its forefoot is due to the fact that when it rains, the humidity increases and the fleas are active on the cat. 4. Frogs Croak all the time and it rains. Frog skin is thin, can feel the change of humidity, so if cry more than usual, that the air humidity is high, it will rain. 5. See The spider web in the morning there are drops of water, the sky will be sunny. When the weather is good, the temperature difference between day and night will become larger, met cold air steam, become small water droplets. 6. Fish jump out of the water, it rains. In the distance, the news of bad weather quickly reaches the water, and the fish jump in surprise. 7. Swallows fly low, it rains. When the weather turns bad, insects fly more on the ground, swallows want to eat insects, so fly low. Facing the coast, when there is thunder in winter, the northwest monsoon will bring heavy rain. 9. Earthworms come out of the ground and it rains. The weather gets worse, the humidity increases, the ground gets warmer, and the worms come out of the ground. 10, the frost by the morning sun shine, will be sunny. The cause of formation of frost is cold at night, and large temperature difference during the day, the temperature is high, will be fine.