Q. Can you wash your hands netilas yodaim by immersing them in snow, as when exiting the house after touching boots or shoes?
A. Horav Shlomo Miller’s Shlit’a opinion is that it is permitted. However, one must be careful not to grind or mash the snow into water by rubbing one’s hands together.
During weekdays, one may immerse hands three times in snow that has a volume of more than forty saah or the amount of water in a mikva, when exiting a cemetery and remove the ruach raah from them.
Rabbi A. Bartfeld as revised by Horav Shlomo Miller Shlit’a