How long does returning to Nantian usually last and end?

3 to 5 days.

Hui Nantian lasts for 3 to 5 days. Generally, if there is cold air to return, Hui Nantian will disappear immediately. If it is always warm, it will last for 3 to 5 days. If it is longer, it can last more than half a month.

Huinantian (referred to as Huinan) is the name for a weather phenomenon in southern my country. It usually refers to the phenomenon that every spring, the temperature begins to warm up and the humidity begins to rise. South China has a typical oceanic subtropical monsoon climate. Therefore, from March to April every year, the warm and humid air blowing from the South China Sea meets the cold air from northern China to the south, forming a quasi-stationary front in Lingnan, which makes South China The weather is unstable and very humid, with light rain or heavy fog during periods, which causes the phenomenon of returning to the south. When the surface of some cold objects encounters warm and humid airflow, it begins to condense and form water droplets on the surface of the object.