What's the temperature in Hefei from mid-April to mid-May? What clothes should I wear on a business trip?

In mid-April, it was late spring in Hefei, the weather was hot, and the temperature was generally between 15-25℃. In mid-May, it is early summer in Hefei (the average summer in Hefei is on May 20th), and the temperature is mostly between 20-30℃. There are occasional thunderstorms and the weather is relatively stable. You can usually wear a thin coat or a T-shirt.