What exactly does the weather forecast mean by North and South?

According to the natural astronomical environment, China can be divided into east monsoon region, northwest arid and semi-arid region and Qinghai-Tibet alpine region. According to the social and economic development, it can be divided into four regions: eastern region, central region, western region and northeast region.

In practice, there are great differences between the north and the south of China, so we divide the northern region and the southern region with the Qinling-Huaihe line as the dividing line. In natural astronomy, the Huaihe River in Qinling Mountains is the dividing line between subtropical monsoon and temperate monsoon, between subtropical evergreen broad-leaved forest belt and temperate deciduous broad-leaved forest belt, between 0℃ isotherm in winter and between subtropical and warm temperate zones. Therefore, in natural astronomy, there is a great difference between north and south of China.

Qinling-Huaihe line is not only the dividing line between north and south of China, but also the 0℃ isotherm in winter. In winter, the temperature in the area north of Huaihe River in Qinling Mountains is below 0℃, and in the south it is above 0℃, resulting in the difference of heating problems between north and south in winter. The river north of Huaihe River in Qinling Mountains freezes! The south won't freeze! The Huaihe River in Qinling Mountains is also the difference of farming methods in China. In the northern area north of Huaihe River in Qinling Mountains, dry land wheat is mainly scattered! The southern part of the southern region is dominated by paddy fields such as rice planting! The Huaihe River in Qinling Mountains is the dividing line of China's climate. Qinling Huaihe River is temperate to the north and subtropical to the south, so it is the dividing line between warm temperate and subtropical! The northern and southern slopes of Qinling Mountains have cultivated different regional landscapes! The northern part of Qinling belongs to deciduous broad-leaved forest belt, and the southern slope belongs to subtropical evergreen broad-leaved forest!

The northern region is located in the north of Huaihe River in Qinling Mountains, mainly including North China Plain, Loess Plateau and Northeast China. The southern region is located in the south of Huaihe River in Qinling Mountains, mainly including the middle and lower reaches of the Yangtze River, Sichuan Basin, southeast hills and Yunnan-Guizhou Plateau. In terms of social economy, the northern region is an important heavy industry and energy base in China. The southern region is more inclined to light industry or mixed light and heavy industries, but natural resources, especially mineral resources, are relatively scarce.