Is it still cold after the start of winter vacation?

as of December 27th, 222, it was still cold after the start of the winter vacation.

after the start of the winter vacation, the vernal equinox didn't arrive until March 21st. It was always winter before, and the weather was still very cold.

winter vacation refers to the holiday during January and February in winter. In China, schools usually divide each school year into two semesters.