I am going to china by December 2012 is the weather is good? or this is winter time?

It is the winter time in China. Well, the climate varies much at different regions. Which place are you going to visit? Generally speaking, it is cool and pleasant in those places in southern part, such as Hainan, Hong Kong, Macau, and Guangdong. It is cold in those places in northern part, such as Harbin, Beijing, Xian and other places.