Commuters gather under warming lamps on one of Chicago's famous "El" lines as they experience wind chills expected to reach far below zero, Jan. 6, 2014.
Two pedestrians go down a street in Chicago's South Loop with temperatures well below zero, Jan. 6, 2014.
Time and temperature signs in Lawrence, Kansas, Jan. 6, 2014.
Daryl Daugherty clears the sidewalk in front of his home in Carmel, Indiana, Jan. 6, 2014.
A man wears a face mask and heavy clothes while walking through downtown Springfield, Illinois, Jan. 5, 2014.