The first solar term of winter

The first solar term in winter is Beginning of Winter.

The Beginning of Winter is the nineteenth of the twenty-four solar terms and the beginning of winter. The bucket handle points to the northwest, and the sun’s longitude reaches 225°. It intersects between November 7 and 8 of the Gregorian calendar every year. , Li, is the beginning of construction; winter is the end, and everything is collected. The beginning of winter means that vitality begins to accumulate, and everything enters a state of recuperation and storage. The climate also transitions from dry and dry autumn to rainy and cold winter.

The commonly used methods for dividing seasons mainly include the "solar terms method" and the "temperature method". Traditionally in China, the "beginning of winter" of the "twenty-four solar terms" is used as the beginning of winter; the "solar terms method" divides Winter means that all things are in a state of recuperation and storage. The "temperature method" divides the season when the daily average temperature drops steadily below 10℃ for five consecutive days.

Meteorological changes

In the beginning of winter, the sun has reached 225 degrees of ecliptic longitude, the daylight hours will continue to shorten, the height of the sun at noon will continue to decrease, and the northern hemisphere will receive less and less solar radiation. , but because the heat stored on the surface in the second half of the year still has a certain amount of energy at this time. Because there is still "accumulated heat" on the earth's surface, early winter is usually not very cold, and the real coldness occurs after the winter solstice.

Due to the large span between the north and the south of China, the climate between the north and the south is very different. Winter with this climatic significance is obviously late for some areas in China. After the beginning of winter, the climate transitions from less rainy and dry autumn to rainy and cold winter climate.

In the south, from the beginning of winter to the light snow, there is often a sunny, warm and comfortable "Little Indian Spring" weather. There is a folk saying of "Little Indian Spring" in October, which is the so-called "Warm Nine in August". The monthly temperature is "lower than the Indian summer" in October. It is generally not very cold in the early winter in the south. As time goes by, cold air frequently moves southward after the winter solstice, and the temperature gradually drops.