Is there halal food near Citadines Central Hotel Xian ?? how far from hotel ? how to get there ??

Yes, there are many halal restaurants nearby your hotel. You are suggested to the restaurant named 'Tongshengxiang Restaurant'. The distance is just about 420 yards. You can just walk to the destination directly.
About Mc.Donald, there is one that is located at no.1, Bell and Drum Tower Square. The distance is about 218 yards. You can also walk to it.

According to the weather forecast, the temperature during that period of time is 21.2 F to 35.6 F. It's cold. You need to bring thick overcoats, jackets and pants in order to keep warm. :-)