What is as cool as water in autumn?

In late autumn, the night is as cool as water.

Late autumn refers to the end of autumn and the ninth month of the lunar calendar. In late autumn, the night is as cool as water, which means the weather in late autumn is like cold water.

"Rosemary Fu" of the Three Kingdoms Wei Dynasty: "The fragrance of autumn is the wisdom of Kunlun Mountain." The Book of Beginners (Volume 3) is quoted by Emperor Liang Yuan of the Southern Dynasties: "September is autumn, also known as late autumn." The third time in Tang Dynasty: "It's already late autumn, and the west wind is rustling." Feng Zhi's Wu Zixu VII: "It's late autumn, but the flowers and plants in the garden are still charming in spring."