The main reason for the rainy weather in Guiyang in winter is affected by what weather system

The main impact is the cold air from the northern continent. After traveling long distances over mountains and ridges, its intensity has been greatly weakened. After climbing up the rugged Guizhou Plateau, the airflow is very slow, unlike the warm air that originally stayed in Guizhou. After the air came into contact, the two sides were evenly matched and a long-term stalemate resulted in continuous rainy weather.