>>239812380% of all sky islands in North America are in one US state (AZ), most of them (but not all) cease to be actual desert above 5-6,000 ft elevation, especially on their north facing sides and in their canyons. You could get a climate with only 7 inches of annual precipitation on the lower southern slopes of one and get a climate that gets 20-40 inches of annual precipitation (including 20-200 inches of snow) on the same mountains' mid-upper northern slopes. They are great though.