What do you mean by going back to Nantian?

Huinan (Huinan for short) is a weather phenomenon in the south of China, which usually refers to the phenomenon that the temperature starts to get warmer and the humidity rises sharply every spring. When Return to the South Sky appeared, the air humidity was close to saturation, and there were wet scenes everywhere.

South China belongs to a typical subtropical monsoon climate. Therefore, from March to April every year, warm and humid air from the South China Sea meets cold air from Siberia, forming a quasi-static front in the south, which makes the weather in the south changeable and very humid, with light rain or fog during the period, 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.

Huinan (Huinan for short) is a unique weather in the southern coastal areas, which refers to a weather "anti-tide" phenomenon caused by the increase of temperature and humidity every spring. Generally, it appears from March to April of the Gregorian calendar every year (February and March of the lunar calendar in spring), mainly because 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.

South China belongs to a typical maritime subtropical monsoon climate. Therefore, from March to April in the solar calendar 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 sea of fog. This kind of weather is called "returning to the south sky" in Guangdong and Guangxi.