Rain solar terms imply the meaning of rain solar terms.

1. Rain is the second of the 24 solar terms. Every February 19 or so, when the longitude of the sun reaches 330 degrees, it is the rain of 24 solar terms. At this time, the temperature rises, the snow melts and the precipitation increases, hence the name rain. The rain solar term generally starts from February 18 or 19 and ends on March 4 or 5. Rain, like Grain Rain, light snow and heavy snow, is a solar term reflecting precipitation.

2. "Twenty-four solar terms": "In the first month, life is full of water. 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 everything begins to sprout before and after the rain and solar terms, and spring is coming. For example, Yizhoushu has phenological records such as "Hongyan coming" and "vegetation sprouting" after the rain.

It began to rain, and the rain gradually increased. The rainy season means that it begins to rain and the rainfall gradually increases. In the Yellow River valley, the birthplace of the 24 solar terms, it was cold before the rain, but it was snowing and raining unpleasantly. After the rain, the temperature can generally rise above 0℃, with less snow and more rain. However, in the warm south, even in the dead of winter, rainfall is not uncommon. The average temperature in most parts of southern China in this period is above 10℃, peaches and plums are in bud, and cherries are in full bloom. It has indeed entered a climatic spring.

Except for a few years, the frost period has ended. It is timely to graft fruit trees and plant trees. After a dry winter, there are many droughts in spring all year round in South China, especially in the western part of South China, where "spring rain is as expensive as oil". In addition, the invasion of cold wave will cause strong cooling and snowstorm, which will do great harm to the old, weak and young animals.