The short-term regenerative climate after the beginning of autumn is often called.

Autumn tiger occurs after beginning of autumn in 24 solar terms, which is a short-term high temperature weather and occupies most areas in summer. It is as overbearing as a tiger, so people call it "autumn tiger". Judging from the climatic characteristics, the autumn sun is like fire, beginning of autumn is hot, and many areas are still hot. Beginning of autumn is the third hot solar term among the 24 solar terms, second only to Daxia and Xiaoxia. Autumn means rainfall, humidity, etc. It is at the turning point of the year and tends to decline or decrease. Seasonal changes, rainfall, dry and wet changes in southern China are obvious; In the north, the obvious change is the temperature. After entering autumn, in nature, the qi of Yin and Yang began to change, everything began to grow from lush to bleak, and the climate began to transition from rainy and humid in summer to dry and rainy in autumn.

Beginning of autumn is the thirteenth of the twenty-four solar terms, and it is the beginning of autumn. The bucket refers to the southwest, and the sun reaches the longitude of 135, and it is celebrated on August 7 or 8 of the Gregorian calendar every year. "Reason" means the beginning; "Autumn" means that the grain is ripe. The change of the whole nature is a step-by-step process, and beginning of autumn is a turning point in which the Yang gradually closes, the Yin gradually grows, and the Yang gradually gets cloudy.