Winter is one of the four seasons, which traditionally begins in beginning of winter, 24 solar terms (October of the lunar calendar). In winter, life is closed and everything enters a state of recuperation.

Li Si's division of four seasons reflects many characteristics such as climate and phenology. The four seasons are often divided according to the temperature change, and the method of "weather average temperature" proposed by modern scholar Zhang Baokun is adopted. In the four seasons divided by the weather average temperature method, the average daily temperature is equal to or lower than 10 degrees Celsius for five consecutive days, which is regarded as entering winter.

Climatic characteristics:

In the middle of winter, the sun's spirit retreats to the yin, life closes, and everything begins to harvest. "Autumn harvest and winter storage", everything is harvested in winter, and winter is the season to enjoy a bumper harvest and recuperate.

In many areas, winter means silence and desolation. When the cold current strikes, living things will reduce their life activities, many plants will shed leaves, animals will choose to hibernate, and some are called hibernation. Migratory birds will fly to warmer places for the winter.

Refer to the above? Baidu Encyclopedia-Winter