In Harrisburg, Pennsylvania, organisers had to use chain saws to break through the ice on what was one of the coldest plunges on record.
Women react as they plunge into the Atlantic Ocean on New Year's Day at Coney Island in the Brooklyn borough of New York City. The air temperature at the time of the swim was 17 degrees Fahrenheit (Minus 8 Celsius)
Men react after going into the ocean during the annual New Year's Day L Street Brownies Polar Bear Plunge in Boston, Massachusetts, where the air temperatures was zero degrees Fahrenheit (minus 18 Celsius)
A man reacts as he emerges from the Atlantic at Coney Island in New York, where the air temperature was 17 degrees Fahrenheit (minus 8 Celsius)