What are the phenomena in nature that indicate rain?

There are many phenomena in nature that can predict rainfall, mainly including the following aspects:

1, meteorological conditions

Meteorological conditions are the most basic factors for forecasting weather changes. Usually there will be some meteorological changes before it rains, such as the air humidity will gradually increase, the sky will get dark and the clouds will be low.

2. Plants and animals in nature

Before it rains, some plants and insects will make some obvious reactions. For example, the leaves of some trees will turn over, called "rain leaves", and some insects will hide under branches or on the ground. These signs indicate that it is more likely to rain.

3. Odor change

There is often a special smell before it rains, because the number of negative ions in the air increases before the weather changes. When electrons combine with oxygen, they will release a pungent smell, which can make people realize that the next rain is coming.

4. Behavior changes of birds

Before it rains, birds often look for shelter from the rain, or return to their nests before it is completely dark. This reaction shows that the probability of rain is increasing gradually.

5. Air pressure change

Before it rains, the air pressure will change to some extent. In areas with low air pressure, the possibility of rain is usually higher. At the same time, natural disasters such as volcanoes and earthquakes can also predict the possibility of rain through the change of air pressure.

6. Cloud color change

When the weather is going to get worse, clouds often have some color changes. If the clouds are gray or black, it means it will rain.

7. Deciduous leaf market

In the growing period of plants, there is often a wave of fallen leaves before it rains, because before the rainy season comes, the body feels that the available resources are decreasing and takes the initiative to remove the excess parts.

8. Swallows fly very low

Swallows fly very low because their important food is insects in the air. Because it's going to rain, the wings of insects feel the humidity of the air and fly very low. Swallows that prey on insects have to fly low, which is a clear sign of rain.