"Let It Snow! Let It Snow! Let It Snow!", also known as "Let It Snow", is a song written by lyricist Sammy Cahn and composer Jule Styne in July 1945. It was written in Hollywood, California during a heat wave as Cahn and Styne imagined cooler conditions. Originally sung by Vaughn Monroe in 1945, it reached Billboard's Best Sellers Number 1 spot. This is the Dean Martin version that originally came out in 1959.