Average annual precipitation is projected to increase slightly in the northeast portion of the Southeast, but may decrease in the southwest half of the region.

There is uncertainty between different climate scenarios for future precipitation projections in the Southeast. Generally, there is a southwest-to-northeast gradient in annual precipitation projections. The greatest increases are projected in North Carolina and Virginia (3-9% increase by the end of the century), and the greatest decreases are projected in Louisiana and Arkansas (3-12% decrease by the end of the century). Overall changes in precipitation for the Southeast are projected to be slight and comparable to current year-to-year variations. Daily precipitation totals in the Southeast have increased substantially in the fall season, and this trend is expected to continue.