Why does the climate in autumn get colder gradually?

After a burst of autumn rain, the weather gradually cooled down. The word gradually means to change slowly, let alone cool down, so the climate is like this, cooling down a little at a time, and finally it comes to winter.

Discrimination: step by step, step by step

"Step by step" has obvious stages and is often used in people's planned efforts. "Learning is gradually improved"

"Gradually" is only used for the change of things.

Extended data

Gradually

Pronunciation: zhúJian

Interpretation: refers to step by step; brick by brick

Example: In this long rescue, I gradually realized that love can save countless lives.