What's the weather like in southern China in spring?

"Returning to Nantian" is the name for the phenomenon of weather resurgence in Hainan, Guangxi and Guangdong in South China. It usually appears in February and March in spring, when the temperature warms up and the air humidity rises sharply. Walls, floors, beds, etc. All wet, even moldy. The "first frost" is the first frost after autumn.

Frost is mostly in the transition season of spring and autumn, with the temperature above zero degrees Celsius during the day and below zero for a short time at night. In agrometeorology, it refers to the phenomenon that the temperature on the soil surface or near the plant crown drops below zero, causing crops to suffer.