Chicago and other areas throughout the Midwest were hit hard by January's polar vortex. The extreme weather event is responsible for 20 deaths and devastated businesses due to business interruption losses, frozenn pipes and other damages. (Photo: Jake Hukee/Shutterstock)

The so-called "polar vortex" of frigid air that swept the United States in late January 2019 was blamed for more than 20 cold-related deaths and shattered low-temperature records across the country. One hospital in Chicago treated more than 50 people for frostbite during the polar vortex.

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