1, the time in Grain Rain is April 19-2 1 of the Gregorian calendar every year. The 24 solar terms are based on the position of the sun on the ecliptic, and Grain Rain is the time when the sun reaches 30 degrees of the ecliptic.

2. Grain Rain is a solar term reflecting precipitation. After the solar term in Grain Rain, the rainfall increased and the humidity in the air gradually increased, which is very suitable for the growth of cereal crops.

3. In Grain Rain season, obvious rain often begins to appear in southern China, especially in southern China. Once cold air meets warm and humid air, it will often form rainy weather for a long time. Qinhuai River is a transitional zone between spring rain in the south and spring drought in the north. From the Qinling-Huaihe River to the north, the spring rain decreased sharply.