White Christmas is a very popular Christmas song that was written by Irving Berlin in 1940 in Arizona of all places! A couple years later in 1942, Bing Crosby sang the song in the musical Holiday Inn and it won an Academy Award for Best Original Song.
It's been recorded by a ton of different artists, from country singers to R&B, with even the California Raisins giving it a chance.
It's a great song and here it is in Spanish.
Blanca Navidad
Oh, blanca Navidad, sueño y con la nieve alrededor blanca es mi quimera y es mensajera de paz y de puro amor.
Oh, blanca Navidad, nieve una esperanza y un cantar recordar tu infancia podrás al llegar la blanca navidad.
Here's a video with Luis Miguel singing Blanca Navidad. As with most singers singing Christmas songs, he takes some of his own liberties with the words, but it's pretty close to the lyrics above. It's also pretty easy to hear the differences, as well, so hopefully it doesn't throw you off too much.