Why do light snow and solar term rain indicate that the weather will get colder and colder?

Rain in the light snow season indicates that the weather will get colder and colder and the precipitation will gradually increase.

Light snow solar terms, like heavy snow solar terms, reflect the changing trend of temperature and precipitation, and are the reflection of ancient farming culture on festivals. Light snow is a solar term with high frequency of cold wave and strong cold air activity. The arrival of the light snow solar term means that the weather is getting colder and colder and the precipitation is gradually increasing. ?

During the light snow solar term, a relatively stable meridional circulation has been established in East Asia, and low pressure or trough often appears in Siberia. When moving eastward, there will be a large-scale cold air heading south, and there will be a large-scale gale and cooling weather in the southeast of China. Light snow is a solar term reflecting the climate characteristics.

Extended data:

There is a folk custom of "curing in winter and storing it to keep out the cold". After a light snow, the temperature plummeted and the weather became dry, which was a good time to process bacon. After the light snow festival, some farmers began to make sausages and bacon, and stored the surplus meat in the traditional way until the Spring Festival.

Some places in the south also have the custom of eating Ciba in October of the lunar calendar. Ciba is a kind of food made by steaming and mashing glutinous rice, and it is a popular food in some areas of southern China.

In ancient times, Ciba was a traditional festival sacrifice in the south of China, which was originally used by farmers to worship the cow god. There is a saying that "in October, Ciba Shao" refers to sacrificial events.