12月20日，宣武门内大街的车流在雪中缓慢前行。12月20日晚，北京部分地区迎来降雪，对市民交通出行产生一定影响。北京市气象台当日发布寒潮蓝色预警信号，受强冷空气影响，双休日城区最低气温将下降至-13℃至-15℃，并伴有4、5级北风。新华社发（贺灿铃 摄） December twenty days,In the street at traffic moving slowly in the snow.Twenty days late dec.,Parts of Beijing have snow,To the public transportation has certain influence.The Beijing meteorological observatory issued the cold wave blue warning signal,By the strong cold air influence,Double cease day city lowest temperature will drop to - 13 ℃ to 15 ℃,Accompanied by 4/Level 5 north wind.The xinhua news agency hair(HeCanLing perturbation)

    12月20日，宣武门内大街的车流在雪中缓慢前行。新华社发（贺灿铃 摄） December twenty days,In the street at traffic moving slowly in the snow.The xinhua news agency hair(HeCanLing perturbation)

    12月20日，宣武门内大街的车流在雪中缓慢前行。新华社发（贺灿铃 摄） December twenty days,In the street at traffic moving slowly in the snow.The xinhua news agency hair(HeCanLing perturbation)

    12月20日，一位居民在雪中遛狗。新华社记者 何俊昌 摄 December twenty days,A resident in the snow walk the dog.The xinhua news agency HeJunChang perturbation

    12月20日，一名保安清扫小区入口。新华社记者 何俊昌 摄 December twenty days,A security sweep village entrance.The xinhua news agency HeJunChang perturbation