Hi, I am going to visit China on January 2014 .Can u tell about weather and clothes? does it snow?

It will be chilly and dry in that time in BJ and the down jacket and the thick sweaters are necessary.
The average temperature in that month is around -8 to 0C.
It is in the snow season, but when it snows depends on the real situation. If you want to ses snow, it is suggested to keep attention on the latest weather forecast.