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South Dakota.—With an annual average precipitation of 19.12 inches, the bulk of this state's rainfall occurs during the warm season. June is the wettest month, with 3.57 inches, and December is the driest, with 0.51 inch. Warm season convective activity, augmenting the effects of midwestern cyclonic storms, contributes markedly to the summer rainfall. Annual precipitation decreases westward across the state, except that orographic rainfall produces a local maximum in the Black Hills area.

Tennessee.—Rainfall of this state, with at annual value of 49.71 inches, is distributed fairr uniformly throughout the year except for a: autumn dry season, with its minimum of 2$ inches in October. The wettest month is March, with ^5.33 inches. Although cyclonic rain is the principal contributor, convective rain is significant during the warm season, and the augmenting effects of orographic lifting are noticeable in the mountains of the southeast.

Wyoming.—The average annual precipitation for this state is 14.22 inches. Cyclonic disturbances of spring are mainly responsible for the May maximum of 2.08 inches. The dry season lasts from late fall through winter, the driest month being December, with 0.71 inch. Warm season convection holds the monthly rainfalls above 1 inch from spring through early fall.