Deep freeze

Ice from the breath of Gail Davis forms around her face as she exercises by walking outside in Minneapolis,more

A commuter ferry navigates through the ice flow in the Hudson River between New Jersey and lower Manhattan more

The U.S. side of the Niagara Falls is pictured in Ontario, January 8, 2014. REUTERS/Aaron Harris

Aldo, a pet dog, leaps through the snow as he runs after his owner, Cyril River, who skates on a Lake of thmore

Students wait for their school bus in a sub-zero temperature in Minneapolis, January 8, 2014. REUTERS/Eric more

A snow-covered scooter is seen in Chicago, January 8, 2014. REUTERS/Jim Young

Ice chunks and water flow over the falls Niagara Falls, Ontario, January 8, 2014. REUTERS/Aaron Harris

Visitors observe the falls in Niagara Falls, Ontario, January 8, 2014. REUTERS/Aaron Harris

The Chicago skyline is framed by icicles in Chicago, Illinois, January 8, 2014. REUTERS/Jim Young

The Rainbow Bridge shown in Niagara Falls, Ontario, January 8, 2014. REUTERS/Aaron Harris

Elmwood Village residents walk down Elmwood Avenue after purchasing needed items from a grocery store in Bumore

An Elmwood Village resident clears snow on Anderson Place in Buffalo, New York January 7, 2014. REUTERS/Domore

Derrell Butler, who is homeless, hangs out by a fountain that has frozen over in downtown Atlanta, Georgia more

A cross country skier makes his way across Lake Calhoun in Minneapolis, January 7, 2014. REUTERS/Eric Millmore

Jennifer Berry watches the sunset from a lifeguard chair at a beach on Lake Calhoun in Minneapolis, Januarymore

A woman is bundled up against the cold weather in Times Square in New York January 7, 2014. REUTERS/Carlo more

A woman walks through the wind and frigid cold temperatures in downtown Manhattan in New York January 7, 20more

A skater is silhouetted on the Rideau Canal after it reopened for ice skating in Ottawa January 7, 2014. Rmore

A woman braces against the wind and cold as she walks in Montreal, January 7, 2014. REUTERS/Christinne Musmore

A NOAA handout image taken from space on January 3, 2014 by the Suomi NPP satellite shows a blanket of snowmore

Ice forms on an abandoned dock structure in the East River due to unusually low temperatures caused by a Pomore

Barry Tilton cleans the snow off of his pick-up truck in the midtown neighborhood of Detroit, Michigan Janumore

Ice forms on the shore of the East River due to unusually low temperatures caused by a polar vortex in New more

Patrick O'Brien jogs around Lake Harriet in south Minneapolis in a Spiderman wind suit, January 6, 2014. REmore

A woman walks through a gust of blowing snow in frigid cold temperatures during winter in downtown Chicago,more

A woman falls while slipping on ice during freezing rain on Roosevelt Island in Manhattan, New York, Januarmore

The Chicago skyline is seen as ice fog rises off Lake Michigan in Chicago, January 6, 2014. REUTERS/Jim Youmore

Tourists look at a camera to see photographs they took of themselves in a snowstorm in Times Square, New Yomore

A person walks past a snow covered bus shelter in downtown Chicago, January 6, 2014. REUTERS/Jim Young

Birds gather on the partially frozen Charles River in front of the Boston skyline during winter in Cambridgmore

Snowflakes collect on a car window during a winter nor'easter snow storm in Waltham, Mass., January 2, 2014more

A woman makes a snow angel in the middle of Times Square in New York, January 3, 2014. REUTERS/Carlo Allegrmore

Crew clears snow in Fenway Park, home of baseball's Boston Red Sox, during a winter nor'easter snowstorm inmore

A New York City bus with chains on its tires is pictured as it drives down 5th Avenue in the snow in New Yomore

Travelers leave the Back Bay train and subway station during a winter nor'easter snow storm in Boston, Massmore

Robert Burck, also known as the original 'Naked Cowboy', poses with a woman after snowfall on the streets omore

Snow makes it way down to the platform of the 65th Street subway station during a winter storm in New York more

A police vehicle drives through a flooded street during a winter nor'easter snow storm in Scituate, Massachmore

A man sleeps inside a subway train during a winter storm in New York January 3, 2014. REUTERS/Zoran Milichmore