Freezing conditions and a major snowstorm that proceeded a blast of Arctic air in America’s midwest has killed at least five people, according to US media.
The morning temperature in Chicago was -30 Celsius which is colder than Alaska's state capital and even colder than parts of Antarctica.
The cause of the sub-zero chill was a swirl of arctic air that broke away from the polar vortex that usually encircles the North Pole.