I want to have a tour in China late November/early December 2013, what's the weather like.

It will be a little cold then, especially the areas of northern China. If you are going to travel in the cities in northern China, such as Beijing, Shenyang and Harbin, thermal clothes are most needed. Sometimes, it may snow. For the cities in the south part, you can take along light sweater and regular jacket and jeans.