Attention: this item is more than 5 years old, links can be broken and information can have been updated.
In browsing other 1-wire resources I found this gem: a snow depth sensor. The page reports of the development and improvements in the measuring of snow depth in Voksenlia, Norway. A place where measuring snow depth is worth it, the local record is over 200 cm of snow. The result of loads of precipitation: over 1000 mm annually.