Is February a rainy day?

English name: Rainwater

Definition: The second of the 24 solar terms falls on February 19 or 20; It means that the weather gets warmer and the rainfall increases. Discipline: atmospheric science (first-class discipline); Applied meteorology (two disciplines)

The Gregorian calendar is a rainy solar term around February 18 every year, when the sun reaches 330 degrees of the yellow meridian, it is a "rainy" solar term. Rain has two meanings. First, the weather is getting warmer and the precipitation is gradually increasing. Second, in the form of precipitation, there is less snow and more rain. The twenty-four solar terms say, "In the first month, water is born every day. Spring belongs to wood, but there must be water for those who grow wood, so there is rain in beginning of spring. If the east wind melts, it will disperse into rain. " It means that the weather gets warmer and the winter snow turns into rain, which leads to the gradual increase of precipitation.

In ancient China, rainwater was divided into three stages: "One stage was that Rex sacrificed fish; Second, wait for Hongyan to come; Third, wait for the grass to sprout. " After the solar term rains, otters start fishing and put the fish on the shore, as if they were sacrificed first and then eaten; Five days later, the geese began to fly back to the north from the south; In five days, in the "moist and silent" spring rain, the spirit of the sun rises everywhere in the vegetation and begins to sprout. Since then, the earth has gradually begun to show a thriving scene.

Rainwater solar term climate

After the rain solar term, the temperature in most parts of China rose to above 0℃, the daily average temperature in Huanghuai Plain reached about 3℃, the average temperature in Jiangnan was about 5℃, the temperature in South China was above 10℃, and the average temperature in North China was still below 0℃.

Before and after rainfall, rape and winter wheat generally turn green and grow, which requires high water content. "Spring rain is as expensive as oil", so proper precipitation is particularly important for crop growth. At this time, the precipitation in North China, Northwest China and Huanghuai areas is generally less, which often cannot meet the needs of agricultural production. If there is little rain in early spring, the best economic benefit can be obtained by timely spring irrigation before and after the rain. In the area south of Huaihe River, it is mainly to strengthen intertillage and hoeing, and at the same time, do a good job in clearing ditches and draining water in the field to prevent excessive spring rain from causing wet damage and rotten roots. As the saying goes, "Water the flowers with wheat, water the flowers with vegetables", and the coated rape should be topdressing with moss fertilizer in time to compete for more pods. South China's double-cropping early rice seedling cultivation has begun, so we should pay attention to "cold tail and warm head", and strive to sow all the seedlings at once.