What air masses are mainly affected by winter and summer in China, and what are the weather characteristics?

In winter, Chinese mainland is mainly controlled by polar continental air mass or denatured polar continental air mass. The weather and climate are characterized by less precipitation and low temperature and dryness, especially the cold wave or strong cold air weather process lasts for a long time and has a wide influence range, accompanied by strong wind and cooling.

In summer, most parts of Chinese mainland are controlled by tropical and subtropical marine air masses and tropical continental air masses. Weather and climate are characterized by high temperature, high humidity and rainy weather.