The windy climate in Zhangjiakou, please, 3Q.

1. Zhangjiakou belongs to temperate continental monsoon climate in terms of natural belt division, and northwest wind prevails in winter. Dry cold air from Siberia will take away excess moisture in the air, resulting in a cold and dry climate. Second, the altitude of Zhangjiakou dam is higher, and the temperature itself is lower than that of low altitude areas at the same latitude. Thirdly, according to the water saturation in the air, the lower the temperature, the lower the water saturation. In other words, the lower the temperature, the less water can be stored in the air, so the air will definitely become drier in winter. As for why the northwest wind prevails in winter, this. . . . . Due to the thermal difference between land and sea, the continental air pressure is high and the southeast ocean air pressure is low, and the air flow will flow from high pressure to low pressure with the air pressure difference, forming a northwest wind in winter.