What are the changes in the weather in autumn?

1, most plants will shed their leaves in autumn, and the leaves of plants will turn from green to yellow or red, which is related to the pigments contained in the leaves.

2. The temperature will drop gradually in autumn, usually slower than in winter. Due to the difference of dry and wet conditions, cold and rainy weather conditions or dry and cool weather conditions appear in different regions. In the cold late autumn, due to the large temperature difference between day and night, the water vapor transpiration during the day will condense at night, either dew or frost.

3. In autumn, the direct point of the sun gradually moves south from the northern hemisphere, passes through the equator after the autumnal equinox, and the sun directly shines in the southern hemisphere. Seen from the northern hemisphere, the angle of the sun gradually becomes lower, and the gap between day and night becomes smaller. In autumn, the distance between the earth and the sun is from far to near.

4. In autumn, most of late rice in South China is at jointing and booting stage, and cotton bolls crack and spit; Mid-season rice and summer corn entered the stage of grain filling maturity. In South China after beginning of autumn, although the season is still midsummer, "beginning of autumn is full of yellow in ten days" and golden "autumn" is coming.