When does Weihai take off its autumn trousers?

Weihai takes off its autumn trousers in May. Because the temperature in Weihai in May is around 14-25 degrees, the weather is neither cold nor hot at this time. There is no need to wear long trousers at this temperature. It will be very hot. We can wear a pair of trousers outside, so it won't be too hot and it's comfortable. You shouldn't wear too many clothes in hot weather. People are uncomfortable wearing too much. So Weihai took off its autumn trousers in May.