What is the origin and custom of slight cold?

Astronomical experts say that the periods of slight cold and severe cold in most parts of China are generally the coldest. As the saying goes, the cold is in the "March 9th". "Sanjiu" is mostly from 65438+1October 9 to 17, which is also within the slight cold solar terms.

The reason why it is cold before and after the slight cold is that there are frequent strong cold air and cold front in 5438+1October in early June. In the slight cold season, the average temperature in most parts of North China is generally around -5℃, and the extreme minimum temperature is below-15℃. At this time, the average temperature in Northeast China is around -30℃, the extreme minimum temperature can be as low as -50℃, and the average maximum temperature in the afternoon is only -20℃.

Extended data:

Meteorologists remind that every cold air process will cause dramatic changes in meteorological factors such as air pressure, temperature and humidity, and people are often difficult to adapt to and get infected with various diseases, such as respiratory diseases. Therefore, in the mild cold season, people should be prepared for cold protection, pay attention to adding clothes to keep warm, tie up buildings such as doors, windows, boards and scaffolding that are easily blown by strong winds, properly place outdoor items that are easily affected by strong winds, and relevant emergency departments should be ready to start emergency plans at any time.

Reference: People's Network-Keep your head cold and your feet warm in the coldest time of the year.