I plan to visit Fenghuangcheng in November. Is that time suitable to visit?

Well, it will be cloudy and rainy at that time, and the temperature will range from 35F to 75F. It may have snow in the late November.
It will not be crowed at that time, so you can appreciate the scenery slowly and carefully. If you are afraid of cold, you may make you schedule a little earlier, like September and October.