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.

Cold Commute

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A commuter walks across the Chicago River in sub-zero temperatures.
IMAGE: SCOTT OLSON/GETTY IMAGES

Lake Michigan

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A frozen Lake Michigan sits still in front of the Chicago skyline. Chicago felt a record low temperature of -16 degrees Fahrenheit on Monday.
IMAGE: SCOTT OLSON/GETTY IMAGES

Walking to Work

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A man barrels through single digit temperatures in New York City as he walks by a steam vent.
IMAGE: ANDREW BURTON/GETTY IMAGES

Trying to Keep Warm

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Homeless men tried to sleep at a Metro Station in Washington, D.C. as temperatures slipped below 10 degrees Fahrenheit.
IMAGE: KAREN BLEIER/AFP/GETTY IMAGES

Walk on the Water

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Walk on the Water

Mist rises along Lake Michigan.
IMAGE: SCOTT OLSON/GETTY IMAGES

Frozen Snow in Detroit

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Detroit is still dealing with several icy inches of snow in the wake of Winter Storm Hercules and the polar vortex that has engulfed much of the nation.
IMAGE: JOSHUA LOTT/GETTY IMAGES

Plane Delays

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A man waits for a flight at Kennedy International Airport in New York City. Thousands of flights were canceled yesterday due to freezing temperatures.
IMAGE: STAN HONDA/AFP/GETTY IMAGES

Chicago Skyline

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North Avenue Beach looked more like an ice rink on January 6, as Chicago temperatures fell farther than they ever had before.
IMAGE: SCOTT OLSON/GETTY IMAGES

Clearing a Path

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A Detroit resident clears his sidewalk.
IMAGE: JOSHUA LOTT/GETTY IMAGES

Ice builds up along Lake Michigan at North Avenue Beach

Ice builds up along Lake Michigan at North Avenue BeachPhoto: Scott Olson/Getty Images

Frigid Night

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A woman walks amid snow and steam in Detroit.
IMAGE: JOSHUA LOTT/GETTY IMAGES