What is the meaning of slight cold in the twenty-four solar terms?

Slight cold is the 23rd in 24 solar terms, and winter is the 5th solar term.

Slight cold, at the end of February and the beginning of ugly month, is also the 23rd solar term among the 24 solar terms and the 5th solar term in winter. Fighting fingers; The meridian of the sun is 285; It is celebrated every year on June 5-7 of 65438+ 10 in Gregorian calendar. Cold air is cold for a long time, and slight cold means that the weather is cold but not extreme. Like severe cold, mild heat, severe heat and intense heat, it is a solar term indicating temperature change. The slight cold solar term is characterized by cold, but it is not extremely cold.

In the slight cold season, the direct point of the sun is still in the southern hemisphere, and the heat in the northern hemisphere is still in a state of loss. The heat absorbed during the day is still less than the heat released at night, so the temperature in the northern hemisphere continues to decrease. After the winter solstice, the cold air frequently goes south, and the temperature continues to drop, and the temperature drops to the lowest during the slight cold and severe cold in a year. There is a folk saying that "it's 239 when it's cold, and it's shivering with cold", which shows the cold degree of solar terms.

North-South Difference of Slight Cold Solar Terms

There is a great difference in climate between the north and the south of China, and long-term meteorological records also prove this point: in the north, the slight cold solar terms are colder than the severe cold solar terms; But for most parts of the south, the big cold solar terms are colder than the small ones.

The slight cold in northern China is colder than the severe cold, because there is relatively little "residual heat" on the surface, which has been released by the slight cold. At this time, the days are short and the nights are long, and the cold air is powerful, which minimizes the temperature. In the great cold, the sun's light and heat increased slightly, so the temperature also increased slightly.

In the south, the surface is hot, and its "residual heat" has not been released until the solar terms are slightly cold, so the temperature has not dropped to the lowest; In the severe cold, the surface "waste heat" is exhausted and it is freezing badly. At this time, the sunlight and heat slightly more than the slight cold will not play much role, and the temperature in the south will be minimized.