1. Check the snow is moist and packable. If a snowball retains its shape the snow is okay
  2. Find a flat spot in the shade to stand your snowman, so he (or she) will last longer
  3. Make a big snowball, then roll it over snow to make a bigger ball. Make 2 or 3 and stack  
  4. Decorate

If you have no snow, worry not. In Albuquerque they make snowmen out of tumbleweed.