We tried snow scupture once a long time ago! It was fricken cold. And being from California (born and raised) we were not versed in the art of staying dry and warm while doing this. Our Ice sculpting friends later explained all the little details on it and we had done everything wrong. Like you need rotating gloves at least 10 pairs to change into as the snow melts on your hands. I believe thier tools are similar to ours in sand but I believe they use things that help scrap it more.
Anyway...it is to cold for me. Our Canadian sand sculptures do it every winter and love it. But then again they were raised in the stuff. I preferr shorts and sandles!