From the Savannah Morning News:
Niagara Falls may seem like an unusual winter destination.
Thousands of tourists from all over the world visit the falls, though, even on the coldest days of the year.
The average temperature in January is 31 degrees Fahrenheit at the falls, which lie on the U.S.-Canadian border. Though the enormous volume of water never stops flowing over the falls, ice formations form along the falls’ banks and the river. An “ice bridge” will form across the river if the temperature is low for long enough.
As cold as it can get in Niagara Falls, though, it’s still a great wintertime getaway.