This solar term is called light snow because "snow" is the product of cold weather. During this solar term, the climate is not deep and the precipitation is not great, so "light snow" is used to compare the climate characteristics during this solar term. "Light snow" is a metaphor, which reflects the active cold current and increased precipitation in this solar term, rather than the light snow under this solar term.
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.
Meteorological changes of light snow solar terms
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 terms do not necessarily snow. In fact, the solar terms with the largest snowfall in the whole year are not in light snow and heavy snow. For example, in the middle and lower reaches of the Yellow River and its vicinity, the solar term with the largest snowfall in the whole year is neither "light snow nor heavy snow" nor "slight cold nor severe cold", but "rain" in spring.
Refer to the above? Baidu Encyclopedia-Xiao Xue