Japanese physical fitness enthusiasts pray while dipping in cold water during a winter ritual to keep themselves fit and to display their perseverance in Tokyo. ((AP Photo/Shizuo Kambayashi))
Russian men enjoy swimming in an ice hole on a lake after relaxing in sauna just outside St. Petersburg, Russia, Sunday, Jan. 4, 2009. ((AP Photo/Dmitry Lovetsky))
South Korean Marines are seen in the snow during a winter exercise in Pyeongchang, east of Seoul. More than 300 Marine soliders participated in the one-month winter exercise. ((AP Photo/ Lee Jin-man))
Winter swimmers wearing ballet costumes of swans from "Swan Lake" plunge into a hole in the ice, St.Petersburg, Russia, Sunday, Feb. 5, 2006. ((AP Photo/Dmitry Lovetsky))
Indian elephant "Rhena" ploughs her way through the snow, pulling children's sleighs at the Krefeld, Germany zoo Wednesday, Jan. 8, 1997. ((AP Photo/Karl-Heinz Kreifelts))
Participants bathe during a European Sauna marathon in Estonian Winter Capita in Otepaa, Estonia, Saturday, Feb. 6, 2016. ((AP Photo/Vitnija Saldava))
Participants run during a European Sauna marathon in Estonian Winter Capita in Otepaa, Estonia, Saturday, Feb. 6, 2016. ((AP Photo/Vitnija Saldava))
A woman is thrown in the air as she celebrates Maslenitsa, or Pancake Week, a traditional Russian holiday marking the end of winter that dates back to the pagan times. ((AP Photo/Ivan Sekretarev))
A family on the frozen lake Balaton enjoys fun on ice near the Hungarian city of Siofok. ((AP Photo/Karoly Penovac))
Japanese physical fitness enthusiasts hold blocks of ice while standing in cold water during a winter ritual to keep themselves fit and to display their perseverance in Tokyo. ((AP Photo/Shizuo Kambayashi))
Players fight for the ball during a soccer match in the snow at a height of 2,250 meters over sea level, in the resort of Verbier, Switzerland, Saturday, April 26, 2008. ((AP Photo/Keystone, Jean-Christophe Bott))
Greek Orthodox men brave the cold weather to dive into Istanbul's Golden Horn and retrieve a wooden cross in a ceremony commemorating Epiphany or the baptism of Jesus Christ. ((AP Photo/Ibrahim Usta))
Hundreds of hockey players participate in the Pond Hockey ice hockey tournament in Lake Winnipesaukee's Meredith Bay Friday Jan. 31, 2014 in Meredith, N.H. ((AP Photo/Jim Cole))
Students battle in a snowball fight Wednesday, Jan. 28, 2009, in Dunn Meadow on the Indiana University campus in Bloomington, Ind. ((AP Photo/Indiana Daily Student, James Brosher))
Strollers play with a dog in the snow on a sunny winter day near Irschenberg, southern Germany on Saturday, Dec. 22, 2007. ((AP Photo/Uwe Lein))
A man prays as he dips in cold water during a winter ritual to keep fit and display their perseverance at Teppozu Inari Shinto shrine in Tokyo, Japan, Sunday, Jan. 11, 2009. ((AP Photo/Itsuo Inouye))
Jamilya Rich, 10, of Washington, makes a snow angel by the sidewalk in Washington, on Monday, March 2, 2009. ((AP Photo/Jacquelyn Martin))
A man takes a photo in front of "SnOpra" snow sculpture at Grant Park in Chicago. ((AP Photo/Nam Y. Huh))
Diego Penaloza, 6, of Mexico City, catches snowflakes on his tongue during a visit to Times Square, Friday, Jan. 21, 2011 in New York. ((AP Photo/Mark Lennihan))
Gunter Hersch cleans a model of the Capitol of Washington model after heavy snowfall in the landscape park Miniwelt (Miniworld) in Lichtenstein, Germany, Friday, Dec. 7, 2012. ((AP Photo/Jens Meyer))
A snowman made with cookies and a red plastic cup sits in front of the Lincoln Memorial in Washington, Wednesday, Jan. 22, 2014. ((AP Photo/Charles Dharapak))
Sabine Conrad plays with her French sheepdog El Lobo in front of the snow covered skyline of Erfurt, central Germany, Thursday, Jan. 17, 2013. ((AP Photo/Jens Meyer))