Average annual precipitation is projected to increase slightly across the Midwest over the next century.

Annual precipitation has generally increased by 5 to 10% across the Midwest compared to the early 20th century, although there have been greater increases as well as slight decreases. There is uncertainty between different climate scenarios for future precipitation projections in the Midwest. Generally, it is expected that annual precipitation will continue to increase slightly across the region, with an additional 2-4 inches of rain per year by the middle of the century across most of the region.