Dear Peter
Welcome to Changzhou. Mid-spring and early autumn are the best time to come, for moderate temperature and less rainfall.
April, May, June, September and October are the best time to travel to Changzhou. But do remember to avoid the period from 1st October to 7th October when is the one-week long national holiday because Changzhou is still a major destination of domestic and international tourists. It's extremely crowded everywhere!
Best regards
XXX
summer ,as is known ,it is a wonderful time to come.