That kind of weather often appears in the south of China in spring.

"Returning to the South Sky" is also called "southerly sky" in some areas, which is a phenomenon of weather resurgence, generally appearing in March and April every year. South China has a typical subtropical monsoon climate. In spring, cold air is still active. When encountering warm and humid airflow, the air humidity is close to saturation, and the phenomenon of "returning to the south sky" appears.

When "returning to the south sky" occurs, the surfaces of cold objects such as indoor floor and glass are easy to condense dew, often accompanied by light rain or fog, and wet scenes are everywhere, which requires people to take moisture-proof measures.