What region's climate characteristics does it mainly reflect?

The twenty-four solar terms mainly reflect the climate characteristics and agricultural situation in the Central Plains of China. Since the main political, economic, cultural and agricultural activity centers in China are mostly concentrated in the Central Plains of the Yellow River Basin in history, the 24 solar terms were established on the basis of climate and phenology in this area.

The origin of the twenty-four solar terms:

Originated in the Yellow River Basin. As early as the Spring and Autumn Period, four solar terms were set, namely, mid-spring, mid-summer, mid-autumn and mid-winter. After continuous improvement and perfection, by the Qin and Han Dynasties, the 24 solar terms had been completely established. In BC 104, the taichu calendar written by Deng Ping officially set 24 solar terms in the calendar, and defined the astronomical position of the 24 solar terms.

The current "twenty-four solar terms" are formulated according to the position of the sun on the return to the ecliptic, that is, the annual movement track of the sun is divided into 24 equal parts, each 15 is 1, and each 1 is a solar term, starting in beginning of spring and ending in severe cold. "Twenty-four solar terms" is an important part of the long history and culture of the Chinese nation and embodies the historical and cultural essence of Chinese civilization.