Slight cold, the 23rd solar term among the 24 solar terms in the lunar calendar, is also the fifth solar term in winter, marking the official start of winter. When the sun reaches the longitude of 285 (slight cold), it marks the arrival of the coldest day of the year in China.

According to China's meteorological data, slight cold is the lowest temperature solar term, and the temperature of great cold is lower than slight cold in only a few years.