I will go to Beijing this december starting from 12/12 until 19/12.

The temperature may range from 20 F to 40 F during that period of time. The possibility of snow will be high. But I'm afraid that there won't have heavy snow days. So the ground won't have thick snow cover. You need to prepare enough winter clothes because this city usually has chilly cold winter. Down jacket, sweaters, snow boots, scarves and gloves are necessary.