A warning sign reads "Beware of Icicles" beside snow and ice-covered trees near a street leading to Feldberg Mountain, outside Frankfurt, Germany, on December 19, 2017. #

Two women react while taking part in the annual New Year's Day L Street Brownies Polar Bear Plunge, with air temperatures at zero degrees Fahrenheit, in Boston, Massachusetts, on January 1, 2018. #

In Savannah, Georgia, a frozen fountain in Historic Forsyth Park still works despite freezing temperatures and rain, photographed on January 3, 2018. Only a few motorists ventured out in the freezing rain that coated bridges and ramps with ice, forcing police to close roads and highways in Savannah. #

Workers cut ice blocks from the frozen surface of Xiuhu Lake in Shenyang, northeastern China's Liaoning province, on December 20, 2017. The ice blocks are used as part of winter tourism activities in the region. #

A firefighter walks by an iced-over car after fighting a seven-alarm fire on January 2, 2018, in the Bronx borough of New York City. The fire, which started around 5:30 a.m. on a frigid Tuesday, is believed to have started on a first floor furniture store before overtaking the entire building. There were numerous injuries reported from the morning fire which took over 200 firefighters to control. #

In Pyongyang, North Korea, children pose for a photo before an ice sculpture depicting a Hwasong-15 intercontinental ballistic missile and self-propelled launcher, as people mark the new year at the Pyongyang Ice Sculpture Festival on Kim Il Sung Square on December 31, 2017. #

In Pyongyang, North Korea, fireworks are seen above the Taedong River during New Year's celebrations as visitors pose for a photo in front of an ice sculpture of an intercontinental ballistic missile at the Pyongyang Ice Sculpture Festival in Kim Il Sung Square on January 1, 2018. #

A layer of ice is broken into pieces floating along the banks of the Hudson River at the Palisades Interstate Park with the George Washington Bridge in the background, on January 2, 2018, in Fort Lee, New Jersey. #

Obdulio Arenas of Paterson, New Jersey, uses a cell phone to capture images of the partially frozen falls at the Paterson Great Falls National Historical Park in Paterson, New Jersey, on January 2, 2018. #

Freezing rain, followed by rain, then cooling below freezing, leaves a thick coat of ice on the branches of a peach tree. Photographed in Massachusetts on December 24, 2017. #

Tourists visit illuminated ice sculptures at Ice and Snow World Park in Harbin, China, on December 18, 2017. The Ice and Snow World Park will host the 34th Harbin International Ice and Snow Sculpture Festival from January 5 until the end of February. #

Men ice-fish at midday on the frozen Bothnia Sea on December 27, 2017, in Vaasa, western Finland. The ice is only 10 centimeters thick and at the safety limit of carrying a loaded man. #