Here's a quick, fun way to amaze your friends during this cold snap. Take some boiling water, go outside and throw it into the frigid air.
What do you get? Snow. Really. Snow!
According to the experts, there is little water vapor in extremely cold air. There is plenty of vapor coming off of boiling water. Once you introduce boiling water droplets into that frigid air, the vapor crystallizes and turns into snow crystals. Instant snow.
Snow machines at ski resorts work on a similar principle.