What are the characteristics of Xiaoxue solar terms?

1. Meteorological change characteristics: 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 going south, and there will be a large-scale gale and cooling weather in eastern China. Light snow solar term is a solar term with high frequency of cold wave and strong cold air activity. When strong cold air affects, it is often accompanied by the first snow in winter.

2. Phenomenological characteristics: The ancients in China divided the light snow into three periods: in the first period, the rainbow disappeared; Second, the weather is rising and the atmosphere is falling; Third, the weather was blocked and turned into winter. The yang in the sky rises and the yin in the ground falls, which leads to the impassability between heaven and earth and the disharmony between yin and yang, so everything loses its vitality, and the heaven and earth are blocked and become a cold winter.

3. Characteristics of farming activities: At the beginning of the light snow solar term, the frozen depth of the soil in Northeast China has reached 10cm, which is almost 1cm on average all day and night, and it has been frozen for more than one meter at the end of the solar term. Therefore, as the saying goes, "the snow area is tightly sealed", and then rivers of all sizes freeze.