Why is it so hot in the south, but it often rains?

Generally, when one side is dominant in cold and warm air, it is mostly sunny. Because the warm air on the ocean still has a great influence, the residue of cold air is still there, which leads to long rainy weather. Come to a warm current to welcome the hot and sunny days.

The south of China is greatly influenced by the westerly belt, and the winds all come from the northwest. There are snowstorms in Europe, Russia and western Libya, and these water vapor also came down from the north, causing extremely strong water vapor to be transported from north to south. Before the snowstorm, summer water vapor entered the south of China through the southeast coast and the southern end of the Qinghai-Tibet Plateau. Now, the water vapor flowing from the north to the south has increased. Together, there is more rain.

Climatic reasons: subtropical monsoon climate, long summer, and because it is close to the sea, the monsoon is easy to blow a lot of water vapor to the mainland, and then meet the cold air in the mainland to liquefy, thus forming a lot of rainfall.

Multi-vegetation in South China: Vegetation has huge roots, which can absorb water from soil. Transpiration of vegetation increases the air humidity in forest areas and provides conditions for atmospheric precipitation. Forest vegetation can increase the roughness of underlying surface, increase atmospheric turbulence, to a certain extent, lift airflow, transport water vapor upward, reduce condensation height, increase water vapor saturation and promote precipitation.