Average annual number of snowstorms for the Midwest region

Average annual number of snowstorms for the Midwest region, defined as events producing 6 inches of snow or more in 24 hours or less, 1901-2001 (Changnon and Kunkel 2006). A value of 0.5 indicates an average of 5 storms in 10 years. The number of storms increases from south to north and is locally highest in the lake-effect snowbelt to the south and west of Lakes Superior, Michigan, Huron, and Erie. Figure courtesy of Illinois State Water Survey.