Introduction to Xiao Han

Introduction to slight cold:

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 branch calendar and the beginning of the ugly month. The sun meridian is 285, and it is celebrated on January 5-7 of the Gregorian calendar every year. Cold air is cold for a long time, and slight cold means that the weather is cold but not yet extreme.

Like severe cold, mild summer heat, severe summer heat and summer heat, it is a solar term that indicates the change of temperature. The slight cold solar term is characterized by cold, but it is not extremely cold.

Meteorological change:

The weather characteristics of slight cold are: it is getting colder, but it is not yet very 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.

therefore, the temperature in the northern hemisphere continues to decrease. According to the long-term meteorological records in China, the slight cold solar terms are colder than the great cold solar terms in the north, but for most areas in the south, the great cold solar terms are colder than the slight cold solar terms. ?

In the slight cold solar term, the East Asian trough developed most strongly and stably, the Mongolian cold high and Aleutian low also reached the strongest and stable, and the ridge scale of the westerly trough reached the maximum, which matched with the strongest westerly intensity. The cooling process of cold air in the slight cold season is frequent, but not many of them reach the cold wave standard.

There is a saying in the northern part of China that "a slight cold is better than a severe cold, which is common but not rare", which means that it is not unusual for a slight cold solar term to be colder than a severe cold solar term.