I don;t know. I live in Chicago where we get our share of snow and freezing precipitation, and if you include snow the verb along with snow the noun and include the various types of frozen precipitation you find outside, I can come up with 20 words pretty easily:

snow
flurry
snowstorm
blizzard
white out
ice storm
powder
sleet
pellet
flake
flock
clump
hail
ice
frost
hoar
rime
spindrift
drift
slush
black ice...

I could see where if you lived in a world were snow was your constant companion and your life depended on knowing what kind of snow was what, I could see having a much bigger vocabularly than this.

---dr.M.