Where in China do you wear short sleeves all year round?

China has such a place, for example, most places in Hainan wear short sleeves, and Xishuangbanna in Yunnan is the same. Wear short sleeves all year round, but occasionally wear long sleeves. So is Taiwan Province Province, which should be hotter than Hainan Province. It is very convenient to query the geographical latitude and longitude of each city on the Internet. Or browse the local weather forecast, and this problem will be solved.