I am planning to visit Huangshan mountains in October 2017.

1. Well, the cable car is available from 06:30 to 17:00. If you want to enjoy the sunrise, you may need to spend a night on the mountain. In generally, the time of the sunrise is around 06:00 in the early morning of October. You may probably miss the sunrise if you take the cable car to get to the top on that day. The time of the sunset is around 17:30-18:00 in October. After the sunset, the cable car may have already closed.
2. Yes, it is possible to camp on the top of the mountain. You can rent a tent when you camp on the mountain.
3. According to the history data, the temperature may be 35F to 70F at that time. It will be quite cold on the top of mountain at night.