1. Sky: The air humidity becomes higher, the air pressure decreases, the sky is dark, the clouds are densely covered, and sometimes there are thunder, lightning and strong winds. 1. Ants can move-ants dig holes in the ground to live. If it rains, these holes will be flooded by rain, so they will run away before it rains.
2. Flying insects fly low-generally, before it rains, the air humidity will be high and the air pressure will be reduced. The moisture in the air will condense on their wings, and the wings of insects will become heavy, so they will not fly very high before it rains.
3. Swallows fly low-there is a folk saying that "swallows fly low and it will rain". This is because the flying insects in the air are not high. Swallows should eat flying insects and fly low. In addition, some insects in the soil also crawled out of the soil, and swallows flew low to catch reptiles to eat. Dragonflies, like swallows, fly low and it will rain. 4. Small fish will float to the surface to breathe-the air pressure at the bottom of the water is low and there is little dissolved oxygen, so small fish will float to the surface to breathe.
5. Snake Gallery-Most snakes hide in caves during the day and go out for food, water, bathing and molting at night. However, when the weather is particularly humid and sultry, holes will also be forced. Therefore, the snake coming out of the hole during the day is a sign of rain, and it is a verification of "the big snake coming out of the hole and the rain coming from the snake gallery".
6. Chickens don't enter the henhouse for a long time-chickens have no sweat glands and sebaceous glands, and they are very afraid of heat due to lack of heat dissipation skills. Before it rained, it was stuffy in the henhouse, so it was found that chickens didn't want to go into the henhouse for a long time, which was a sign that a thunderstorm was coming.
7. Earthworms come out of the hole-the ground is wet and soft, and earthworms will climb out of the ground, indicating that it will rain.
It turns sunny to cloudy, but the cicada doesn't bark-the cicada's cry is made by the membrane vibration of its abdominal sound generator. In summer, cicadas will bark about 2 hours before it rains and their eyes turn cloudy, but when it turns cloudy on a sunny day, cicadas will not bark.
9. dogs soak in water-because dogs have no sweat glands, they can't rely on pores to dissipate heat in summer, so they can only keep constant temperature by opening their mouths and pulling their tongues to dissipate heat. When dogs feel very stuffy, they will jump into ponds or streams and soak in water to help dissipate heat. So finding a "dog in the water" indicates that it is going to rain.