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Caption:CHICAGO, IL - JANUARY 05: A commuter makes his way to work as temperatures hovered around zero degrees Fahrenheit during the morning rush on January 5, 2015 in Chicago, Illinois. Temperatures are expected to remain in the single digits today and three to six inches of snow are expected to fall this evening. (Photo by Scott Olson/Getty Images)
Caption:CHICAGO, IL - JANUARY 05: A commuter makes his way to work as temperatures hovered around zero degrees Fahrenheit during the morning rush on January 5, 2015 in Chicago, Illinois. Temperatures are expected to remain in the single digits today and three to six inches of snow are expected to fall this evening. (Photo by Scott Olson/Getty Images)

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    Cold weather slams U.S.

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Cold weather slams U.S.

Cold weather is gripping much of the country, and it's going to get worse before it gets better.

Cold weather slams U.S.

Cold weather is gripping much of the country, and it's going to get worse before it gets better.