How many rainy months are there in spring?

Generally, the rain in February and March is mostly due to the rain in the 24 solar terms of February 19. When the longitude of the sun reaches 330 degrees, the solar term begins. At this time, the temperature rises, the snow melts and the precipitation increases, hence the name rain. The solar terms of rain, westerly jet and the south branch of East Asia are obviously weakened, the adjustment and conversion period of long wave ridge is shortened, and the Mongolian high and Aleutian low are obviously weakened. The weather process in the Jianghuai area has also changed significantly. Before and after the influence of cold air, the temperature changes greatly, cold and warm air masses meet, and even rain and snow weather occurs. Some weather proverbs about rain are based on rain and snow to predict the later weather, such as "Rain turns cloudy with rain" and "Rain falls, cloudy turns Grain Rain". According to the cold and warm weather, there are "cold rain, warm shock" and "warm rain, cold shock" Some people also predict the weather in the later period according to the wind, such as "rain comes from the east, and it will rain in the dog days" and so on. After the arrival of the rain solar term, the temperature changes greatly, so people should prevent the occurrence of early spring epidemic diseases such as colds. The weather characteristics of rain solar terms have great influence on the growth of overwintering crops. An agricultural proverb says, "Rain and dew are good crops, and Da Chun Koharu is a treasure." According to the weather characteristics, the vast rural areas should carry out weeding and fertilization on the middle tillage such as Sanmai, clear ditches and bury soil moisture to prepare for drainage and waterlogging prevention.