The USGS topo shows top of Mt. Bohemia at 1465 feet. It's exactly 800 vertical to the road along Lac LaBelle south of the peak. You'll need scuba gear along with your skis to get to 900 vertical as the lake is still at 600 feet according to USGS. Average steepness of the 800 vertical is 19.6 degrees. There are sections between 1200 feet and 800 feet that do approach 40 degrees.
Google Earth did a better job with Lutsen's peak which is at 1688 feet according to USGS. It drops to 800 feet elevation with a consistent 18 degree pitch.
I have not compiled stats but I'm pretty sure lake effect is the primary driver of snowfall in the Midwest. Mt. Bohemia is ideally situated in this regard and the website said they got something like 290 this past season. Lutsen, overlooking the upwind NW side of Lake Superior, is likely to be snowmaking dependent unless someone cares to show me otherwise. For both areas, with the considerable south exposure and low altitude, how quickly does the snow cover melt off? Do they still have full coverage in mid-March? How much is left by the end of March?
While Google Earth is still the best way to get a good view of a ski area, the USGS feature on SkiMap North America is likely to be more accurate for steepness calculations.