Traditional Culture Encyclopedia - Weather forecast - Excuse me, what month is the Great Cold?
Excuse me, what month is the Great Cold?
Hello, I am happy to answer your questions.
In the twenty-four solar terms. The Great Cold is the last solar term among the twenty-four solar terms. It occurs when the sun reaches 300° of ecliptic longitude on January 20-21 of the Gregorian calendar every year.
In the ancient book "Tongkao Tianshi" quoted from "Sanli Yizong", it was explained: "The big cold is the middle one, and its shape is superior to the small cold, so it is called big...the cold is the reverse extreme, so It's called the Great Cold. "It's extremely cold. This solar term falls between the 39th and 49th periods, when cold waves move south frequently, making it the coldest period of the year.
Folk proverb goes: "Small cold and big cold are cold when there is no wind." Big cold means that the weather is extremely cold. Although the winter solstice is the time when the sun is at its lowest in the northern hemisphere, the coldest time of the year is the minor cold and major cold periods after the winter solstice, especially the major cold period. This is because after the winter solstice, the direct sunlight point will Gradually moving north, but for a period of time thereafter, the direct point of the sun is still in the southern hemisphere, and the heat in the northern hemisphere is always in a state of dissipation. The heat absorbed during the day is still less than the heat released at night. Therefore, after the winter solstice, the temperature in the northern hemisphere It continues to drop, reaching its lowest temperature during the Great Cold, which is the coldest solar term of the year. Due to the vast territory of our country and the large span between north and south, there are great differences in climate between the north and south regions. According to my country's long-term meteorological records, there is no mild cold in the Great Cold solar term in the north; but for most areas in the south, the coldest is during the Great Cold solar term. Replaced with "During the Great Cold Season, the average temperature in most areas of southern China is 6°C to 8°C, which is nearly 1°C higher than the Lesser Cold. The proverb "the Lesser Cold and the Great Cold are all cold" shows that the Great Cold is also a cold period of the year. .
Meteorological changes
During the Great Cold season, the atmospheric circulation is relatively stable, and the circulation adjustment period is about 20 days. During this type of circulation adjustment, large-scale rain, snow, and strong winds often occur. . When there is a long-wave ridge to the west of 80 degrees east longitude and a large coastal trough in East Asia, my country will experience continuous low temperatures under the influence of northwest wind flow and continuous replenishment of cold air. Like Xiaohan, Dahan is also a solar term that indicates the degree of cold weather in China. According to year-round climate data statistics, the coldest period of the year in northern my country is mid-January (11th to 20th) of the Gregorian calendar every year.
The annual Xiaohan solar term is from January 5th to 7th. A solar term lasts about 15 days starting from the beginning of the day, and the middle period falls within the Minor Cold solar term; therefore, for most areas in the north, the Minor Cold is indeed colder than the Dahan solar term, but for most areas in the south, it is the coldest during the Dahan solar term. The Great Cold in the South usually starts on January 20th, and late January is the coldest period of the year in the South.
Great Cold
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Great Cold
Farming Activities
During the Great Cold, it is necessary to grasp the changing laws of cold and warm in agricultural production, and pay attention to them at any time according to different years, different geographical locations, terrain conditions, etc. The meteorological department's forecasts for each period should be used to plant crops reasonably to avoid unnecessary losses, especially when introducing cash crops on a large scale. Pay attention to the surrounding terrain environment when planting on a small scale. Around large reservoirs, due to the temperature-regulating effect of water, there is often less or no freezing damage.
Having introduced so much, let’s talk about why we need to sweep graves on a cold day:
On the day of the severe cold here, the Chinese New Year is coming soon, so we need to sweep the tombs and put new soil on the graves, which means that at the end of the year, we also tidy up the houses of the ancestors. Of course, the customs vary from place to place. They are also different.
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