Lesser Cold (Xiao Han)

Xiaohan is the 23rd of the 24 solar terms, the fifth in winter, the end of the Ganzhi calendar month and the beginning of the ugly month. Bucket finger; The solar yellow meridian is 285 °; The festival is handed in on January 5-7 of the Gregorian calendar every year. The cold air is cold for a long time. The slight cold means that the weather is cold but not to the extreme. It is the solar term indicating the change of temperature, just like the great cold, slight heat, great heat and summer. The characteristic of the solar term of light cold is cold, but it is not cold to the extreme.

In the mild cold season, the direct point of the sun is still in the southern hemisphere, and the heat in the northern hemisphere is still lost. The heat absorbed during the day is still less than that released at night, so the temperature in the northern hemisphere continues to decrease. After the winter solstice, the cold air frequently goes south, the temperature continues to decrease, and the temperature drops to the lowest during the slight and severe cold of the year. As a folk saying goes, "a little cold is at 239, and the sky is cold and the earth is cold to shake", which shows the cold degree of the solar term of little cold.

According to China's long-term meteorological records, the solar terms of mild cold are colder than those of severe cold in the north, and there is a saying that "mild cold is better than severe cold" in the north; However, for some areas in the south, the annual minimum temperature will still appear in the cold solar term.