Some areas in the United States dropped to their coldest temperatures in years as a polar vortex flooded the country from Canada, spreading into the Midwest and expanding to other states from coast to coast.
Wind chill in Minnesota reached -50 degrees Fahrenheit — that's cold enough for exposed skin to get frostbite in 5 minutes. Plenty of other places saw sub-zero weather, temperatures so cold that many officials shut down schools, highways and tourist attractions as a means to try to keep people inside. Here are few spine-shivering photos.
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