Osmanthus fragrans never fails to live up to autumn, which means: when autumn comes, Ginkgo biloba turns yellow, and it fails to live up to the good will of autumn. Ginkgo biloba leaves fall, and autumn finally fails to live up to autumn, because it knows autumn by falling leaves.
Yellow ginkgo leaves fall down, just like butterflies dancing in the air in autumn. But like a butterfly in late autumn, it disappears so quickly and silently that it can only capture its beauty in an instant. Autumn is one of the four seasons. In China, traditionally, the "beginning of autumn" with 24 solar terms is the starting point of autumn.
Entering autumn means that rainfall and humidity tend to decrease or decrease, and everything in nature begins to grow from luxuriant to mature. According to the climatic average temperature of modern scholar Zhang Bao _, four seasons are divided. The index is that the period when the average temperature is lower than 1℃ is winter, the period when it is higher than 22℃ is summer, and the period from 1℃ to 22℃ is spring and autumn respectively.
China's four seasons are often divided according to the temperature change, which is based on the "climate average temperature" proposed by modern scholar Zhang Bao _. According to the weather average temperature method, there are two main criteria for judging autumn:
First, the average daily temperature for five consecutive days is between 1℃ and 22℃, which can be regarded as autumn and become a "short label".
Secondly, the moving average temperature of five consecutive groups is lower than 22℃. A set of moving average temperature refers to the average temperature of the day plus the average temperature of the previous four days divided by 5, and the 5-day moving average temperature is obtained, which is a "sliding scale". Entering autumn means that the hot weather has passed and it is beginning to cool.