Chicago

People walk in the snowfall in downtown Chicago, the United States, Dec. 29, 2017. Snow continued to fall on Friday in Chicago area with temperature below minus 10 Celsius degrees. The snow and cold were affecting flights, and more than 100 flights were cancelled in O'Hare International Airport and Midway International Airport. (Xinhua/Wang Ping)

Road and vehicles are covered with snow in downtown Chicago, the United States, Dec. 29, 2017. Snow continued to fall on Friday in Chicago area with temperature below minus 10 Celsius degrees. The snow and cold were affecting flights, and more than 100 flights were cancelled in O'Hare International Airport and Midway International Airport. (Xinhua/Wang Ping)