Which solar term did the cold weather in Shu start from?

The cold weather in Shu begins from the solstice of winter.

The ancients believed that the winter solstice is an important solar term for the transformation of Yin and Yang, representing the beginning of the next cycle and a day of good luck, and "counting nine" also began from then on. From the solstice in winter to nine, every nine days is a "nine". By "99", the weather turned warmer, and most parts of the country had entered spring, also known as "99 sunny day".

Jiujiu, also called Jiujiu in winter, is a folk method to calculate the date of warm flowers in spring and cold days in China. Generally, March and April are the coldest time, which is the coldest time of the year.

The winter solstice, also known as the southern solstice, winter festival, sub-year, etc. It has both natural and humanistic connotations. In southern China, there are customs of offering sacrifices to ancestors and enjoying the winter solstice. In northern China, it is a custom to eat jiaozi from winter to Sunday every year.