out by the coast it can be very unstable winters, but everywhere else it's pretty awesome =). Winter of 1997 we had 2,46 meters (8 feet+) of snow at sea-level in the city I live in, Tromsoe, and even more in the mountains. At average it's about 1,5-2 meters (in the mountains) of snow where i ride. But it's quite rare to have real powder like you guys "over there" have tho.
As mentioned we ride straight from sea-level to as much as 1830 meters (6000feet). I know places you can go as far as 2900 feet in one pull straight from the parking lot at sea-level.
The bad thing is that it's only trails in Norway, and few of them, no dedicated areas to freeride, like they have in Sweden, and if you get caught outside the trails you're gonna have to dig deep in your pockets