Cool weather is described by idioms.

Pinyin: qi ū gā o q ě shun

Interpretation: Describe Wan Li in crisp autumn.

Source: Tang Du Fu's poem "Cui Shi Dongshan Caotang": "Love you, Yushan Caotang is quiet, and the autumn is crisp and fresh."

Example: Fang intends to send a general to the west. ★ Liang Qing Zhu Jin's "Two Essays on Autumn Rain, Poor Poetry"