The slight cold symbolizes that most parts of China have entered a period of severe cold, with frozen soil and frozen rivers. In addition, the cold air in the north keeps going south and the weather is cold, so people call it "several cold days". Although it is not as cold as the north in the south of China, the temperature has dropped obviously. The coldest time in the south is a slight cold and a severe cold, and between rain and fright. It is dry and cold when it is slightly cold, but it is wet and cold after rain.
In ancient China, the "slight cold" was divided into three stages: "First, waiting for Yanbei Township, second, waiting for the magpie to start its nest, and third, waiting for the pheasant to start its life." The ancients believed that the geese among migratory birds migrated along the yin and yang, and at this time, the yang had moved, so the geese began to migrate northward; At this time, magpies can be seen everywhere in the north, and they feel the sun be the spirit and start building nests; The word "pheasant" means singing, and pheasant will sing when it is close to April 9.