What does "winter snow, winter snow, winter snow, winter cold" mean in the solar term Song Dynasty?

Refers to the four solar terms, namely beginning of winter, light snow, heavy snow and winter solstice.

Twenty-four solar term song

The spring rain shakes the spring and the valley days, and the summer is full of mountains and summers.

Autumn dew, autumn frost, little snow in winter and cold in winter.

Twenty-four solar term song's poems, nursery rhymes and nursery rhymes are compiled for the convenience of remembering the twenty-four solar terms in the ancient calendar of China. Twenty-four solar terms have existed in Song Dynasty since ancient times. The first four sentences each contain six solar terms in spring, summer, autumn and winter. Each sentence takes one of the six solar terms. The name of the twenty-four solar terms is two words. If you remember the solar term Song, you will remember half of the 24 solar terms. The 24 solar terms are listed as follows:

Spring: beginning of spring, Rain, Sting, Equinox, Qingming, Grain Rain;

Summer: long summer, small full, mangzhong, summer solstice, big trees, small trees;

Autumn: beginning of autumn, early summer, Bailu, autumnal equinox, cold dew and early frost;

Winter: beginning of winter, light snow, heavy snow, winter solstice, slight cold and severe cold.