Ken Libbrecht’s Field Guide to Snowflakes describes all the different types of snowflakes in detail, including annotated sketches and photographs. The text describes how snowflakes grow and form. The taxonomy of snow is categorized succinctly here. If you want to go outside and really look at snowflakes, this is your book.
You can also find an abbreviated version on the author’s website (www.snowcrystals.com). There are also companion products including a gallery snowflake photos, prints, ” computer wallpaper,” and stamps.