freeze

A pedestrian walks along the banks of the Neris river as temperatures dipped to -18 degrees Celsius (-0,40 degrees Fahrenheit) in Vilnius, Lithuania, Monday, Jan. 20, 2014.

Mindaugas Kulbis/AP

A pedestrian walks along the banks of the Neris river as temperatures dipped to minus 18 degrees centigrade in Vilnius, Lithuania, on Monday.

Polar Vortex Weather System Brings Artic Temperatures Across Wide Swath Of U.S....NEW YORK, NY - JANUARY 07:  Commuters walk through Manhattan's Grand Central train terminal on January 7, 2014 in New York City. A 'polar vortex'  of frigid air centered on the North Pole dropped temperatures to a record low 4 degrees in New York City.

John Moore/Getty

Commuters find refuge in Manhattan’s Grand Central train terminal as temperatures drop below freezing in New York city. 

Ice forms on an abandoned dock structure in the East River due to unusually low temperatures caused by a Polar Vortex in New York January 7, 2014.

Lucas Jackson/Reuters

Ice forms on an abandoned dock in the East River as extreme freezing conditions, known as a polar vortex, hit New York. The Atlantic seaboard of the US is gripped by the coldest weather it has had in decades