A boat is trapped in the ice in Hamburg, Germany, on February 8, 2012. (Photo by Matthias Schrader/Associated Press)

A buoy layer makes its way through sheets of floating ice on the river Oder at the German-Polish border near Hohenwutzen, eastern Germany. (Photo by Klaus-Dietmar Gabbert/Dapd)

A Portuguese Water Dog named Zephyr tries to navigate the deep snow while playing with its owner, Joe Stamp, during a winter storm in Hartford, Connecticut. (Photo by Jessica Hill/Associated Press)

Blades of grass are encased in ice after a lawn sprinkler valve froze and broke in Salina, Kansas on December 14, 2010. (Photo by Tom Dorsey/Salina Journal)

Cats enjoy frosty winter weather. Russia, November 29, 2011. (Photo by Alla Lebedeva)

This image provided by the U.S. Coast Guard shows waves from Lake Erie crash onto the Cleveland Harbor West Pierhead Lighthouse on Tuesday, as the subzero air temperature caused the water to freeze in multiple layers, coating the entire structure in ice and making it virtually impossible for mariners to see the light. (Photo by Petty Officer 2nd Class Lauren Jorgensen U.S. Coast Guard/Associated Press)

Early morning walkers and their dog stroll Tynemouth beach in England, November 28, 2007. (Photo by Owen Humphreys/Press Association)

A woman rides in a forest in Smilovichi, Belarus, December 15, 2010. (Photo by Viktor Drachev/AFP Photo)

Snow dusts the landscape of the Schlaubetal park near Mixdorf, Germany on November 29, 2010. (Photo by Patrick Pleul/AFP Photo)

A Kamchatka Brown Bear rests in the first snow at the Zoo in Gelsenkirchen, Germany, November 29, 2010. (Photo by Martin Meissner/Associated Press)

A gull flies over the frozen waters of the Black Sea near Constanta, Romania on February 1, 2012. (Photo by Vadim Ghirda/Associated Press)

Bison along the Bitterroot Valley's Eastside Highway north of Stevensville, Montana, are covered in snow following a blizzard on November 23, 2010. (Photo by Perry Backus/The Missoulian)

A man walks through snow near Castleton, England, Novovember 25, 2010. (Photo by John Giles/Press Association)

The former tower of the city wall is decorated as a candle in Zell an der Mosel, Germany. (Photo by Harald Tittel/Dapd/Associated Press)

Reed sprouts are covered with thick ice at lake Zwischenahner Meer ind Bad Zwischenahn, in northern Germany on January 31, 2012. (Photo by David Hecker/Dapd)

The snow-covered landscape is reflected in the lake near the northern German town of Sonnenberg on November 27, 2010. (Photo by Frank May/AFP Photo)

Flowers are covered in snow at the Orangerie park in Strasbourg, France, on November 29, 2010. (Photo by Frederick Florin/AFP Photo)

A woman peers out of a frost-covered bus window in Bucharest, Romania on February 1, 2012. (Photo by Vadim Ghirda/Associated Press)

A heating plant is seen on a winter's morning in Minsk, Belarus, as temperatures fell to minus 5.8 degree Fahrenheit on February 1, 2012. (Photo by Sergei Grits/Associated Press)

A young couple enjoys a cold afternoon at a frozen pond in Prague, Czech Republic. (Photo by Petr David Josek/Associated Press)

The back window of an S-Bahn commuter train run by German railway giant Deutsche Bahn is covered with snow and icicles at a station early on December 2, 2010 in Berlin, as the German capital is covered with a white blanket of snow. (Photo by Johannes Eisele/AFP Photo)

Lamp posts are covered in ice in the Adriatic coastal town of Senj, Croatia on February 7, 2011. (Photo by Darko Bandic/Associated Press)

Archie Kirk plays in the snow in Brighton, England on December 3, 2010. (Glyn Kirk/AFP Photo)

A cow looks out of its stable behind icicles in Davos, Switzerland. (Photo by Arno Balzarini/Keystone)

Small frozen air bubbles are trapped in the surface of a frozen lake at Hebburn, England on February 3, 2012. (Photo by Scott Heppell/Associated Press)

A baby elephant takes a walk in the snow at the zoo in the northern German city of Hanover on December 3, 2010. (Photo by Holger Hollemann/AFP Photo)

Waterfowl are seen on a frozen river in Minsk, Belarus. (Photo by Sergei Grits/Associated Press)

Ice covers cliffs as the waters of the Black Sea are frozen near the shore in Constanta, Romania on February 1, 2012. (Photo by Vadim Ghirda/Associated Press)

A stray dog peers through a fence at a shelter in Glina, Romania on January 30, 2012. (Photo by Vadim Ghirda/Associated Press)

Snow covers trees in Rubi, Spain. (Photo by Manu Fernandez/Associated Press)

An ice-covered boat sits at a landing stage at the Lake of Geneva in Versoix, Switzerland on February 3, 2012. (Photo by Martial Trezzini/Keystone)

The landmark sculpture “Angel of the North” by British artist Antony Gormley stands amongst snow near Gateshead, England, on November 28, 2010. (Photo by Andrew Yates/AFP Photo)

Ice clings to trees and grass along the lakefront after wind gusts upwards of 40 miles per hour blew waves onto the shore and temperatures in the low teens quickly turned the spray to ice December 13, 2010 in Chicago, Illinois. (Photo by Scott Olson)

Icicles cover a decorated Christmas tree in Moscow, Russia, December 27, 2010. (Photo by Natalia Kolesnikova/AFP Photo)

Falling snow covers a dragon sculpture on a column of roses at the Temple of Heaven in Beijing following the year's first snowfall on February 10, 2011. (Photo by Frederic J. Brown/AFP)

With a cold arctic blast descending on Spokane, the Riverfront Park SkyRide, parked just below the raging Spokane Falls, is encased in frozen mist and icicles January 31, 2011. (Photo by Dan Pelle/The Spokesman-Review)

Ice floes float on the Wadden Sea in Neuharlingersiel, Germany, on December 28, 2010. (Photo by Ingo Wagner/AFP Photo)

Skiers are dwarfed by ice-coated trees at the Zao Onsen ski resort at Zao, a mecca of winter sports in northern Japan, February 2, 2012. (Photo by Associated Press)

A male cardinal pauses on a snow-covered dogwood branch while searching for food during a wet and heavy snowfall Friday, February 25, 2011, in West Bath, Maine. (Photo by Pat Wellenbach/Associated Press)

Heavy snow fall covers the Ironbridge World Heritage Site on December 22, 2010 in Ironbridge, England. (Photo by Christopher Furlong)

Angus cows graze in a field in the French village of La Petite Pierre on December 17, 2010. (Photo by Frederick Florin/AFP Photo)

Crab apples are covered in snow and ice at the Liptovska Mara dam in Slovakia on December 5, 2010. (Photo by Joe Klamar/AFP Photo)

A windswept beach is desolate following a snow storm on December 27, 2010 in Westport, Connecticut. (Photo by Spencer Platt)

A merle forages in a snow-covered garden in Ludwigsburg, southern Germany, on December 17, 2010. (Photo by Thomas Kienzle/AFP Photo)

Seagulls rest along a riverside walk in New York City, January 27, 2011. (Photo by Emmanuel Dunand/AFP Photo)

Heavy snow is blown by high winds along Highway 13 near Burnsville, Minnesota on February 20. 2012. (Photo by Brian Peterson/The Star Tribune)

Justine Crowley walks on Weston Road during a snow storm in Wellesley, Mass., January 12, 2011. (Photo by Bill Greene/The Boston Globe)

The Chicago skyline is reflected on a thin layer of ice as a chunk of snow-covered ice floats in Monroe Harbor one day after a blizzard dumped the third largest snowfall in Chicago's history. (Photo by Charles Rex Arbogast/Associated Press)

Snow blankets a park in Benxi, in China's Liaoning province, January 24, 2011. (Photo by Ng Han Guan/Associated Press)

A duck walks on a partially frozen lake in Bucharest on February 2, 2011. (Photo by Daniel Mihailescu/AFP Photo)

Deer are seen in a pasture as snow covers the landscape near Schinnen, Netherlands, December 17, 2010. (Photo by Ermindo Armino/Associated Press)

Horses roam through snow-covered trees in their pasture near the Lower Roy Lake Road in Nisswa, Minnesota, December 31, 2010. (Photo by Steve Kohls/Brainerd Dispatch)

Trees are covered in snow and hoar frost on December 30, 2010 in Sieversdorf, Germany. (Photo by Patrick Pleul/AFP Photo)

The afternoon sunshine helps melt some of the mounds of snow in Fort Wayne, Indiana on February 8, 2011. (Photo by Laura J. Gardner/The Journal Gazette/Associated Press)

Lights reflect in the ice covering a tree on the grouds of the Indiana War Memorial in Indianapolis, January 31, 2011. (Photo by Michael Conroy/Associated Press)

A Joshua tree and desert scrub brush are covered with snow as storm clouds blow through Palmdale, California in the Mojave Desert, January 3, 2011. (Photo by Reed Saxon/Associated Press)

The fountain of Piazza della Repubblica is frozen on December 17, 2010 in Rome. (Photo by Andreas Solaro/AFP Photo)

Snow-covered branches frame a late night winter scene off of Dam Neck Road in Virginia Beach, Virginia, as a major storm moves out of the region, leaving over a foot of snow in its wake, December 26, 2010. (Photo by L. Todd Spencer/The Virginian-Pilot)

A cross-country skier makes her way across Feldberg Mountain near the German city of Frankfurt am Main on December 17, 2010. (Photo by Boris Roessler/AFP Photo)

Footprints are frozen in the snow and ice during a freezing rain in Lexington, Kentucky, December 16, 2010. (Photo by Charles Bertram/Lexington Herald-Leader)

A man with a child on a sled walks past trees covered in snow and hoar frost on December 30, 2010 near Oberhof, Germany. (Photo by Robert Michael/AFP Photo)

The sun sets over snow covered fields near the village of Salsburgh, Scotland on December 8, 2010. (Photo by Jeff J. Mitchell)

Inge Sandvoss, 71, enjoys cross country skiing around Cannon Hill Park in Spokane, Washington on December 31. Sandvoss says when there is enough snow, she skis through the neighborhood instead of going to Mt. Spokane. (Photo by Dan Pelle/The Spokesman-Review)

A person crosses Broad Street during a snow storm, December 26, 2010, in Philadelphia. (Photo by Matt Slocum/Associated Press)

Frost covers a window in Zurich, Switzerland on February 4, 2012. (Photo by Alessandro Della Bella/Keystone)

Ice coats branches during a freezing rain storm in Tuxedo Park, N.Y. on Tuesday, January 18, 2011. (Photo by Denis Paquin/Associated Press)

Hoar frost clings to trees in Dillon, Colorado along the waters of Dillon Reservoir after temperatures dropped to nearly -20 degrees through the night and into the morning December 17, 2010. (Photo by Mark Fox/Summit Daily News)