The Driest States in the U.S. Revealed by NOAA Data
According to NOAA's 1991-2020 climate normals, the western and interior regions of the United States are home to the driest states in the country. Nevada tops the list with an average annual precipitation of just 9.54 inches (242.3 mm), followed by Utah at 12.26 inches (311.4 mm) and Wyoming at 12.97 inches (329.4 mm). These states experience low precipitation due to their geographic features, such as mountain ranges that block moisture from Pacific storms and their distance from major oceans. Other states in the top 10 include Arizona, New Mexico, Montana, Colorado, North Dakota, Idaho, and South Dakota. These areas are characterized by arid or semi-arid climates, with significant variations in precipitation depending on elevation and proximity to mountain ranges. The data highlights the critical role of mountain snowpack and seasonal precipitation in sustaining water resources in these regions. 
