What is winter?

Winter generally refers to winter, which is one of the four seasons. Traditionally, winter begins with 24 solar terms "beginning of winter". In winter, life is closed and everything enters a state of recuperation. In winter, that is, "everything will be harvested in the end", after beginning of winter, everything began to be hidden. Li Si's division of four seasons reflects many characteristics such as climate and phenology.

At present, 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. According to 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.

Extended data:

In northern China, snow is an important symbol of winter. In the middle and lower reaches of the Yellow River in northern China and its vicinity, the snow in winter is often not as big as the light snow solar terms. The main reason is that the light snow solar term is ahead, the temperature is high, the total amount of water vapor in the air is larger than that of heavy snow solar term, and the possibility of heavy snow is greater.

In fact, the solar term with the heaviest snow in the middle and lower reaches of the Yellow River and its vicinity is neither "light snow and heavy snow" nor "slight cold and severe cold" (because the temperature was low at that time and there was less water vapor in the atmosphere), but a rainy solar term in spring.

In winter, the climate is cold, with yin flourishing and yang declining. Affected by the cold temperature, the physiological function and appetite of the human body will change. Therefore, it is very necessary to adjust the diet reasonably, ensure the sufficiency of essential nutrients, improve the cold tolerance and immune function of the elderly, and make them spend the winter safely and smoothly. Tonifying in winter is one of the traditional self-care methods to prevent diseases, strengthen the body and help the weak.

Baidu Encyclopedia-Winter