Arizona’s reputation for extreme heat and extended droughts belies the remarkable diversity of landscapes and ecosystems found across the state. Steep elevation changes create sharp local climate gradients, sustaining everything from cool, high-elevation mixed conifer forests to sun-baked desert scrub in the lowlands. This interplay between rugged terrain and variable climate helps make Arizona one of the most ecologically diverse regions in the American West. 

 

The state experiences two distinct wet seasons: the summer monsoon, marked by fast-moving, intense thunderstorms, and the winter season, characterized by gentler rains and high-elevation snowfall. These patterns shape how water is delivered and stored in soils, with significant consequences for ecological communities and natural resource management. Large-scale shifts in Pacific Ocean temperatures further influence storm tracks across the region, producing cycles of multi-year wet spells and extended drought. 

 

In recent decades, global climate change has begun altering many of these long-standing patterns. This presentation examines the historical forces behind Arizona’s climate variability and explores how they may evolve in a warming climate.