i will be travel to harbin on the 3oth dec to 3 dec..how the weather there??n on the 3rd to 7th jan to beijing, any snow there?

You may refer to that you are traveling to Harbin from Dec. 30th to Jan. 3rd, right? Well, it will be very cold there, with the average temperature of around -17C. You'd better prepare enough warm clothing as well as gloves, masks and scarves.

BJ won't be that cold in Harbin, and the average temperature is around -5C. Cloudy days would be the majority. You still need winter clothing.