What does it mean to throw away the fans in autumn and wear them indiscriminately in February and August?

This proverb means that the weather gets cold after the beginning of autumn, so there is no need for a fan. However, with the changeable weather, people's dressing habits will also change.

"In autumn, throw away the fan" means that when it gets cold in autumn, fans are no longer needed. "In February and August, I dressed casually" means to describe the changeable weather in early spring and early autumn. People don't often wear clothes. Some people wear too much, others wear very little.