Arizona’s climate is arid and semi-arid, with average annual precipitation ranging from 3 inches in the southwest at Yuma to around 40 inches in the White Mountains in east central Arizona.

The southwestern desert is hot, with winter daytime temperatures in the lower 60s and summer daytime temperatures between 105° and 115° F. Nighttime temperatures on the desert drop slightly below freezing in the winter, while elsewhere in the state, winter nights frequently drop into the 20s.

 

Arizona State Climate Summary

Click on this link to see the latest NOAA NCEI state climate summary

 

Regional Climate Centers

Western Regional
Southern Regional
High Plains Regional
Midwestern Regional
Southeast Regional
Northeast Regional

 

Regional Integrated Sciences and Assessments

Southwest RISA
West RISA
Pacific RISA
Western Water RISA
South Central RISA

 

Southwest U.S. Station Climate Summaries

Click on this image to access individual station summaries

 

Climate History

Click on these links for:

Arizona Facts

Notable Storms in the 20th Century

Tropical Cyclones in Arizona

Historic Extreme Temperatures in Phoenix and Yuma

Historic First/Last Days Temperature Thresholds in Phoenix and Yuma

Annual and Monthly Records Phoenix

Annual and Monthly Records Yuma

Phoenix Snowfall History

Phoenix NWS Watch/Warning Criteria

Phoenix NWS Storm Event Summaries