What causes the north wind to blow more in Laiwu in winter?

Laiwu is located in the warm temperate zone and belongs to the humid and semi-humid monsoon climate. Summer is controlled by the southeast monsoon, with more water vapor and precipitation, and winter is cold and dry under the influence of the northwest monsoon. In addition, due to the influence of local topography, the change of near-surface thermal circulation will also change the wind direction. However, Laiwu is mainly controlled by the cold air mass in winter, running southward, and often blowing northerly winds in winter.