Whatever your passion is, imagine being this excited at work. Apparently snow thunderstorms are fairly uncommon.
According to Wikipedia, they are more common with the lake effect nearby, such as near the Great Lakes region. Other areas that see this several times per year are Nova Scotia, Salt Lake, and the Midwest, but usually not until March.
Boston must not get these very often, as we can see from this video.
Watch this weatherman's over-the-top enthusiasm spike higher and higher until he seems ready to explode with excitement.