Why is it so dry in winter?

1, low-temperature water vapor condenses, and all the water vapor in the air is taken away.

2. The transpiration of plant leaves falling off (or stomata closing) is reduced, and the water vapor entering the atmosphere is reduced.

3. The evaporation rate decreases at low temperature, and the amount of water vapor in the air decreases.

In winter, the land wind in China is mostly northwest wind-not to mention the water vapor in the wind blowing from the dry northwest land and the local vapour band.