we with our 10-year-old daughter plan to travel Shanghai, Beijing and Harbin from Jan 4-14.

In BJ, it may be cloudy and the temperature may range from -5C to 5C.
In Shanghai, it may be cloudy and rain lightly sometimes. The temperature range would be from 5C to 15C.
In Harbin, it may be cloudy and snow sometimes, and the temperature would vary from -25C to -10C.

It is a little bit cold in BJ and Shanghai, and bitter cold in Harbin. Apart from warm clothes, you should take scarves, gloves, and boots. Keep warm and have fun! :)

Thanks for the reply