Introduction of slight cold solar terms

The slight cold solar terms are introduced as follows:

Slight cold is the 23rd solar term among the 24 solar terms, the 5th solar term in winter, the end of the second month of the dry calendar and the beginning of the ugly month. 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 summer heat, severe summer heat and intense summer 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.

Meteorological changes of slight cold solar terms

During the slight cold solar term, the East Asian trough developed the strongest and most stable, the Mongolian cold high and Aleutian low also reached the strongest and most stable, and the ridge scale of the westerly trough reached the maximum, which matched the strongest westerly intensity. The cooling process of cold air is frequent in the slight cold season, but few of them reach the cold wave standard.

There is a saying in northern China that "slight cold is better than severe cold, which is common but not rare", meaning that the solar terms of slight cold are colder than those of severe cold, which is nothing unusual. Slight cold usually occurs from February 9th to March 9th, which is the coldest time of the year in northern China. After the slight cold, the temperature of heavy cold rose slightly. The coldest in southern China is in April and September, which is colder than in March and September. In April and September, it was the great cold solar term, and the great cold in the southern region was colder than the slight cold.

The above contents refer to Baidu Encyclopedia-Xiaohan.