Custer County RainfallUnited StatesSDCuster County20%Custer 20% Chance 25%Hermosa 25% Chance 25%Fairburn 25% Chance 20%Dewey 20% Chance 35%Buffalo Gap 35% Chance Big Rock ParkBismark LakeBrown FieldBuffalo GapCenter LakeCrazy HorseCusterCuster County AirportCuster State ParkCuster State Park AirportDeweyFairburnHermosaJewel Cave National MonumentLegion LakePringleSanatorStockade LakeSylvan LakeWind Cave National Park