What kind of weather is generally called returning to Nantian?

Huinantian (Huinan for short) is the name of a weather phenomenon in southern China, which usually refers to the phenomenon that the temperature starts to get warmer and the humidity starts to rise every spring.

South China belongs to a typical maritime subtropical monsoon climate. Therefore, from March to April every year, warm and humid air from the South China Sea in China meets cold air from the north of China, forming a quasi-static front in Lingnan, which makes the weather in South China changeable and very humid, with light rain or fog in between, resulting in the phenomenon of returning to the south. Some cold objects begin to condense after encountering warm and humid airflow, forming water droplets on the surface of the objects.

When winter goes and spring comes, it's warm and cold at first. When people get up, they find the world outside the window is a vast fog.

Sea, this kind of weather is called "returning to the south sky" in Guangdong and Guangxi.

Returning to Nantian is a phenomenon of warmer weather, which generally appears in February and March in spring. The main reason is that after the cold air leaves, the warm and humid airflow quickly counterattacks, resulting in an increase in temperature and air humidity. Some cold objects are easy to produce water droplets when they encounter warm and humid airflow. The tropic of cancer in the south is more serious, which is related to the sea and humid air in the south. When Return to the South Sky appeared, the air humidity was close to saturation, and the walls and even the ground would "bubble". Everywhere is wet, and the air seems to be able to wring water out. Dense fog is the most distinctive appearance of "returning to the south sky"

According to statistics, when the phenomenon of returning to the south is serious, the visibility can be reduced to 50 meters. In the return weather in the south, some items or food are easy to get wet, and then moldy and rotten. Therefore, appropriate moisture-proof measures should be taken. In summer, even if there is humid ocean airflow, the walls and floors are not cold enough inside and outside, and the walls and floors will not get out of water.