The cold snap that hit most of the US was miserable. We stayed home for a week, curled up in blankets with hot tea and hot chocolate. But to have a little science fun, we took one of the coldest days and sprinkled some boiling water on it. It was 12* with the wind chill putting us in the negatives.
When you toss the water into the air, it creates a larger surface area, turning the water into small droplets. If it's cold enough, the droplets freeze, turning them into a cloud of crystals before hitting the ground. Pretty cool, huh?