What changes when autumn comes?

In autumn, the hot air gradually fades, the day is hot and the night is cool, and the temperature will gradually turn yellow from high to low. The leaves of trees changed from lush green to yellow, some turned red and began to shed leaves. The grass withered, turned yellow from green, and the crops began to mature and harvest. In late autumn, everything is bleak

With the gradual decline of temperature, the leaves of many deciduous perennial plants will gradually change color, wither and fall off, leaving only branches for winter. Panicum miliaceum will come to the end of his life, wither and die. Seasonal variation covers many aspects of climate characteristics, and it is not accurate to judge autumn only by temperature. The most obvious change in autumn is that the leaves of vegetation change from lush green to yellow, and the leaves begin to fall and the crops begin to mature.

Extended data

In China, traditionally, the "beginning of autumn" in the 24 solar terms is the starting point of autumn. Entering autumn means that rainfall and storms tend to decrease or decrease, and everything in nature begins to mature from lush.

The division of four seasons is often based on the change of temperature, and the division of "climate average temperature" by modern scholar Zhang Baokun is adopted. According to the weather average temperature method, the daily average temperature for five consecutive days is between 10℃-22℃. Entering autumn means that the hot weather has passed and it is beginning to cool down.

The standard of average temperature in autumn adopted in meteorology is: after the intense summer heat, the average temperature for five days will be kept below 22℃, that is, it will enter autumn, and when it is lower than 10℃, it will end in autumn (average temperature: 0: 00, 6: 00, 12, 18) and enter autumn.

Baidu Encyclopedia-Autumn

Baidu Encyclopedia-Autumn