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Arizona’s climate is prone to extreme changes that range from persistent droughts to frequent local and regional flooding. These changes are evident in hydrologic data collected. Streamflow records indicate that a drought in Arizona during 1999–2004 was the worst drought since the early 1940s and possibly earlier. Droughts result from a decrease in the number of already infrequent storms that bring moisture to Arizona. The drought conditions in the Southwestern United States over the last several years, and especially in Arizona, have resulted in several large summer fires, a decrease in potable water for some smaller communities, and depleted water available for surface water as well as ground-water recharge. An unusually wet December 2004 and January 2005 in Arizona has interrupted the multiyear drought. Dry conditions, however, still prevail in parts of Arizona. It is difficult to conclude, therefore, whether the drought is over or if it will persist.

Hydrologic conditions in Arizona during 1999-2004: a historical perspective