What does it mean to be frozen into a ball of ice with slight cold and severe cold?

Slight cold and severe cold freeze into a ball, which means that the temperature is very low during the solar terms of slight cold and severe cold, which is generally the coldest time of the year.

It is an agricultural proverb circulating in the south of the Yangtze River, which literally means that the temperature is very low during the solar terms of slight cold and severe cold, which is generally the coldest time of the year. Although the setting sun in the northern hemisphere is the most serious during the winter solstice solar term, the coldest time of the year is the slight cold or severe cold solar term after the winter solstice solar term.

Slight cold and severe cold season are the coldest climate in a year. Source: Zou Nan's "La Drum Drives Spring-Slight Cold": "But most people often regard slight cold and great cold as one, and there is no strict difference. As the saying goes, a slight chill gives birth to ice hockey. " Slight cold and severe cold are solar terms indicating temperature changes, and the periods of slight cold and severe cold in most parts of China are the coldest periods.

Therefore, there is a folk saying: slight cold and great cold, cold turns into ice, and it is combined. According to China's long-term meteorological records, there is no slight cold in the great cold solar terms in the northern region; But for most parts of the south, April and September are the coldest, so the big cold solar terms are colder than the small ones.

Every year from June 5438- 10, strong cold air and cold front activities are frequent in China. During the slight cold season, the most obvious feature is that the north wind blows in most parts of China. Before and after each cold air process, it will cause dramatic changes in meteorological factors such as air pressure, temperature and humidity. "When the cold air cools the local area by more than 8℃ within 24 hours, and the lowest temperature of the day is lower than 4℃, it becomes a cold wave. The Meteorological Bureau generally issues a cold wave warning before the arrival of the cold wave. "