What are the weather characteristics of Xiaoman solar terms?

During the Xiaoman solar term, there will be more and more rainfall in the south of China. Warm and humid air from the southern ocean is active and meets cold air from north to south. At this time, there will often be sustained and large-scale heavy precipitation in South China, causing heavy rain or torrential rain.

Jiangnan area, are often rivers and lakes. If there is little rain at this stage, it may be that the Pacific subtropical high is weak and located in the south, which means that it is Huangmei season. In the north, there is little or no rain in the solar terms, during which the temperature rises rapidly and the temperature difference with the south further narrows.

Phenological phenomena in Xiao Man

Some works in ancient China divided Xiaoman into three stages: "Waiting for the bitter vegetable show, waiting for the grass to wither, and waiting for the wheat autumn." In other words, after the full solar terms, bitter vegetables have flourished; After that, some soft grass with shady branches began to die in the strong sunlight; In the last period of Xiaoman, wheat began to mature.

On the third day, the summer solstice was originally written, and later the record in the Book of Golden History was changed to the autumn solstice. Although it is still summer, it is a mature "autumn" for wheat. For example, the "Moon Order" said: "Wheat autumn to April; The summer of solstice is in May. Xiaoman is in the middle of April, so it's easy. Autumn, a hundred valleys mature, this is summer, and the wheat is autumn, so it is also the cloud of wheat autumn. "

Reference to the above content: Baidu Encyclopedia-Xiaoman