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Officials have warned people to avoid going outside, since frostbite and hypothermia could set in within minutes.
Some temperatures have gotten as low as minus 66 degrees Fahrenheit with windchill - that's colder than Antarctica, according to the Weather Channel.
Here's what the areas hit hardest by the polar vortex look like right now.
As the polar vortex continues, many social media users in the Midwest have added Antarctica to their weather apps, just so they can share images like this:
It's proof that the temperatures they're experiencing are colder than those on the planet's southernmost continent.
But perhaps more startling than the numbers are the images emerging from the cities and states experiencing this intense cold.
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Lake Michigan looks like something out of the movie "The Day After Tomorrow." In Chicago, workers lit kerosene-soaked ropes on fire next to frozen train tracks in order to keep trains running.
Here's what the reality of the polar vortex looks like on the ground.