Mist rises from Lake Michigan as temperatures dipped well below zero on Monday in Chicago, Illinois. Chicago. But climate scientists say the weather does not invalidate prevailing climate models, and one says that reactions to this week’s polar vortex suggest that “people have forgotten what cold is like.”

Over the past few days, some parts of the Midwest dipped to nearly -40°F (-40°C)—with windchill, -60°F (-51°C)—and states as far south as Alabama and Georgia experienced colder temperatures than they’ve had in years. More than 20 deaths have been reported as a result.

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