What are the climatic characteristics of the 24 solar terms?

The 24 solar terms mainly reflect the climate in which region:

The twenty-four solar terms mainly reflect the climate of the middle and lower reaches of the Yellow River with Luoyang to Kaifeng as the center.

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. Because 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 the climate and phenology in this area.