White Christmas
Will San Marino, CA have a white Christmas?
San Marino, California had snow on the ground on Christmas morning in 0 of the last 30 Christmases (1996 to 2025). None of them was white. Almost never.
Measured at U C L A, 20 miles west of San Marino. A white Christmas is an inch or more of snow on the ground at the Christmas morning reading, the line NOAA uses, counted from the station's own daily record.
The forecast for Christmas morning in San Marino starts on this page on December 18.