Vehicles are buried under 21 inches of snow in a dormitory parking lot at Ellsworth Air Force Base, S.D., April 10, 2013 during a snowstorm. The average annual amount of snowfall in South Dakota is 24 to 30 inches across most of the state, and 60 to 100 inches in the Black Hills. (U.S. Air Force photo by Airman 1st Class Zachary Hada/Released)