For some, the best way to ring in the new year is with an icy, cold swim.
People from around the world gathered in Pennsylvania to take a dip in the Susquehanna river for this year's penguin plunge.
Swimmers ranging in age from eight to 80 braved the cold temperatures all for the sake of charity.
Volunteers who took the plunge raised thousands of dollars for the Humane Society.
The money goes towards finding homes for hundreds of animals in need.
Plungers who braved the elements say even though it's cold, the good cause makes it worth it.
Geir Magnusson, who was born in Iceland, said, "We jump in the river and the lake but first we have to break the ice."
"It is for a good cause and I don't really care if I get cold," Sammy Schwab, who participated in her second plunge, said.
And young Devon Rodirguez-Cayro said she plunges for the love of animals: "I love animals and I am not old enough to volunteer for the Humane Society so this is a good way to help out."
This is the 15-year-old's fifth plunge. She has raised over 20,000 dollars to date, and says she's looking forward to helping animals find a home.