The meaning of Chushu is pronounced three times. The "chu" in "chushu" is pronounced in the third tone (chǔ). The Ming Dynasty's "Yue Ling Seventy-two Collections" explains "Chu": "In the middle of July, Chu, stops, and the heat has stopped here." It can be seen that "Chu" in "Chu" is a verb, and should be read The upper tone is the third tone. Ending the summer heat means "going out of the heat", which means leaving the heat. When the heat reaches the end, the direct sun point continues to move southward, the solar radiation weakens, the subtropical high pressure also retreats southward, and the heat gradually subsides.

Sushu is a solar term that reflects changes in temperature. The original meaning of "Chu" means "to stop" and "to stay", and "Chu" means that the hot summer days are coming to an end. As the sun's altitude continues to decrease, the heat it brings also weakens. The scorching summer heat has gradually subsided. Although the heat is on the decline and the temperature will not suddenly rise, there will still be short-term hot weather during this period and the coolness will not start. The real coolness will usually not start until after the white dew.

In the summer season, the direct point of the sun continues to move southward, and solar radiation weakens; the western Pacific subtropical high pressure retreats southward, and the Mongolian cold high pressure begins to show its edge. During this period, thunderstorm activity is less active than in hot summer, and the general trend of heavy rains across the country is weakening. The summer solar term is the early stage when the rainfall distribution in South China changes from more in the west and less in the east to more in the east and less in the west.

Southwest and West China regions, due to being on the edge of the subtropical high pressure and the influence of mountains, have more thunderstorm activities. In September, most of China begins to enter a period of little rain, while Western China has more autumn rain. It is a special weather phenomenon in autumn in Western China. Under the control of cold high pressure, sinking, dry cold air is formed, and the rainy season ("seven down and eight up") ends in the Northeast, North China, and Northwest regions of northern China.