2. In the severe cold season, cold waves frequently go south, which is the coldest period in most parts of China. Severe cold, like slight cold, is also a solar term representing the degree of cold weather. In ancient China, the Great Cold was divided into three stages: "One stage is chicken milk; Second, the symptoms of bird disease; Three times, the water is strong. " Among them, the third period can especially show that the temperature of the great cold is extremely low: at this time, the ice in the water can freeze to the center of the water, and it is thick and firm. Judging from these records, it seems that the Great Cold should be colder than the Minor Cold. But in fact, because it is close to spring, it may not be as cold as before.
3. In the severe cold season, there is still little farm work in all parts of China. Most people in the north are busy composting, storing fertilizer, preparing for spring, or strengthening the cold and antifreeze of livestock. Do a good job in the field management of crops such as wheat in the south. According to the calendar, because most of the time in beginning of spring is after the New Year, the Great Cold is the last solar term in a year, so there is also a saying that "the Great Cold welcomes the New Year". The main traditional activities include catching up with the New Year, putting up windows and ending the sumptuous food.
4, cold health should conform to the principle of "hiding" in winter, the easiest way is to go to bed early and get up late. In cold weather, we should insist on physical exercise. While keeping warm, we should also pay attention to the surrounding humidity.