Parts of America are seeing their coldest winter for decades as snowstorms continue to batter many states.
Here, a partially-frozen American side of Niagara Falls is lit up by coloured lights at night. Near-record low temperatures have closed thousands of schools in America's north east and grounded many flights.
The Great Lakes in the north of the country are freezing over too. This satellite image taken by Nasa on March 3, shows the ice covered lakes Superior (top) and Michigan. Researchers say the entire Great Lakes system is 90% iced over: the record is 94.8% back in 1994.
These are the Horseshoe Falls at Niagara Falls, which have frozen for the second time in weeks. Over the weekend a powerful winter storm pummelled much of the east coast of the US.
Parts of America are seeing their coldest winter for decades as snowstorms continue to batter many states. Here a man walks in front of the partially frozen American side of the Niagara Falls during below-freezing temperatures in Ontario.
A man walks away from a vehicle after it ran off the icy road in the north eastern coastal state of Delaware. The snow and ice have caused lots of travel problems.
Here's Greg Novak with the giant 50-foot snowman he's created in Minnesota. He says it took him hundreds of hours to build the snowman named Granddaddy, that he hopes will cheer people up if they're feeling fed up with the winter.
There were opportunities to have a bit of fun too. A large snowball fight broke out on The Mall in America's capital, Washington, DC on Monday.