I'll add to it as I come across books that we've read and liked.
Allen When the Snow Comes (talks about animals getting ready for winter)
Buehner Snowmen at Night
Cuyler The Biggest, Best Snowman
Howell Zoo Flakes ABC (snowflakes made with animal shapes)
Murphy Baby Polar
Shertle What Do You Need to Make a Snowman?
Wilson Don't Be Afraid, Little Pip
Wilson Mama, Why?
Wilson Winter Snow
Winget Sam the Snowman