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Chart of the Day: Gauging the deep freeze

As the so-called Polar Vortex continues to roll across the U.S. this week, frigid temperatures have snarled traffic both on land and in the air, making for tortuous commutes and lengthy delays.

The swirl of Arctic air brought subzero temperatures to much of the Midwest on Monday, with some wind chills dropping to -40 degrees Fahrenheit or (gasp!) colder.

The blast even challenged Central Park's record low, 6 degrees, which was set in 1896.

JetBlue grounded all its flights into Boston and the New York area late Monday, and more than half the flights at Chicago's O'Hare International Airport were closed as fuel supplies froze, leaving crews unable to fill aircraft tanks, according to the Associated Press.

Siberians and other cold-weather enthusiasts are used to these temperatures, but it's a rare occurrence for the East Coast. In honor of the chill, let's take a look at some key freezing points.