Where did beginning of winter come from when the north wind sneaked in quietly?

The north wind sneaked in quietly, and the autumn was not strong, which was the beginning of the "early winter" in Bai Juyi's winter. The weather in Jiangnan in October is very good, and the scenery in winter is as lovely as that in spring. Frost didn't freeze the grass to death, but the sun dried the earth. Although the leaves of the old Zheshu tree are yellow, they are still like new ones. At this time, I only envy the drinker's leisure and walk into the restaurant unconsciously. In his later years, Bai Juyi was also known as a Buddhist in Xiangshan and a great realistic poet in Tang Dynasty. He is a famous poet and writer with far-reaching influence in the history of China literature. His poems have a wide range of themes, diverse forms and popular language, and are known as "Poet Saint" and "Poet King". Official to Hanlin bachelor, Zuo Zanshan doctor. Up to now, there are Bai's "Changqing Collection", and the representative works include Song of Eternal Sorrow, Charcoal Man, Pipa Travel and so on.