The origin of rain solar terms

With the footsteps of beginning of spring, rain is the second solar term in a year. The ancient book "Twenty-four solar terms" records: "In the first month, water is in the sky, and beginning of spring belongs to wood. However, those who have grown wood must also have water, so it rained successfully in beginning of spring. If the east wind melts, it will disperse into rain. " So "rain" means that the spring breeze gradually blows all over the earth, the ice and snow melt, and even the air in the north begins to become moist, showing a thriving scene everywhere.

From the meteorological point of view, the highest temperature in most areas of China can generally rise above 0℃ after the rain, and the average temperature in many areas in the south is above 10℃. At this time, rape, winter wheat, etc. Generally, it will turn green and grow, which requires higher water content. As the saying goes, "Spring rain is as expensive as oil", and suitable precipitation is very important for the growth of crops. At this time, the precipitation in North China, Northwest China and Huanghuai areas is generally less. If there is little rain in early spring, timely irrigation after rain is beneficial to crop growth.