Why is the temperature in Wulanchabu low in January?

Wulanchabu belongs to temperate wind climate, with dry summer and little rain, windy and cold winter. For Wulanchabu, it usually turns cold in mid-February from 1 and it is coldest in mid-February from1. That is, when the weather is coldest in the big and small cold seasons, with the passage of time and the change of seasons, spring comes and the weather gets warmer slowly. On the count of nine, it's not cold.