By D. A. (Midwested) on Monday, January 20, 2014 - 02:36 am:
I did some quick calculations regarding the percentage of snow fallen that is still on the ground.
Interesting results:
Keweenaw County = 19%
John Dee = 23%
MTU, KRC at Houghton County Airport = 31%
MTU, Mont Ripley = 36% (They cheat)
Twin Lakes = 26% (estimate)
Sunlight, wind, and average temperatures would play into sublimation, blowing and melting. Plus there would be a bit of a non-linear factor regarding compaction.