1. Rain is the 2nd of the 24 solar terms. Around February 19 every year, when the sun's yellow longitude reaches 330 degrees, it is the rain of the 24 solar terms. At this time, the temperature rises, snow and ice melt, precipitation increases, so named rain. The rainy season usually starts on February 18th or 19th and ends on March 4th or 5th. Rain, like Guyu, Xiaoxue and Daxue, is a festival that reflects the phenomenon of precipitation.

2, "the moon season seventy-two wait collection": "the middle of the first month, the sky is born water. Spring is the beginning of the wood, but the wood must be water, so the spring following the rain. And the east wind is thawed, then scattered and rain." Meaning, before and after the rainy season, everything began to sprout, spring is coming. Such as in the "Yi Zhou book" after the rain festival "Hong Yan to" "grass and trees sprouting" and other weather records.

3, the beginning of rainfall, rainfall gradually increased. The meaning of the rainy season is the beginning of rainfall, rainfall gradually increased, in the twenty-four seasons of the origin of the Yellow River Basin, the weather before the rain is cold, but see the snowflakes flying, difficult to hear the rain patter. After the rain, the temperature generally rises above 0 ℃, with less snow and more rain. However, in the warm climate of the southern region, even in the middle of winter, rainfall is not rare. Most areas in the south of China during this period of time, the average temperature is more than 10 ℃, peach and plum buds, cherry blossoms, indeed, has entered the climate of spring.

4, in addition to individual years, the frost period to this end. Grafting fruit trees, reforestation, it is time. South China following the winter dry, perennial spring drought, especially in western South China is "spring rain is as expensive as oil". In addition, the cold wave invasion can cause strong cooling and blizzard, the old, weak, young animals are very harmful.