Pima County Climate
Pima County, Arizona
Avg Annual Temp
68.1°F
Annual Precip
13.4"
Annual Snowfall
0.8"
Extreme Heat Days
139.09999999999997
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Pima County Weather
Deep South Heat in the Sonoran Desert
Pima County’s annual average temperature of 68.1°F far exceeds the national median, reflecting its position in the heart of the Sonoran Desert. Despite the heat, it receives 13.4 inches of rain, which is relatively high for an arid American region.
Consistently Above the State Average
At 68.1°F, Pima County is significantly warmer than the Arizona average of 63.5°F. It remains one of the state's warmer urban hubs, driven by high summer peaks and mild winters.
Moderated by Elevation Compared to Pinal
Pima County is slightly cooler than neighboring Pinal County, which averages 70.1°F annually. However, it receives more rainfall than Yuma County, which sees only a third of Pima's 13.4-inch precipitation total.
Searing Summers and Gentle Winters
Extreme heat defines the local weather, with 139 days per year hitting at least 90°F. July averages a high of 85.4°F, while winters remain exceptionally mild with less than an inch of snow annually.
Manage Intense Sun and Monsoon Rains
Robust air conditioning and sun protection are vital for the 139 days of extreme heat. Residents should also prepare for flash flooding during the summer monsoon season, which contributes significantly to the 13.4 inches of annual rain.
Frequently Asked Questions
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Data source: NOAA National Centers for Environmental Information (NCEI), U.S. Climate Normals 1991-2020.
Climate normals are 30-year averages of weather variables computed from 1991 to 2020. Station data is aggregated to county level using spatial averaging. Data is informational only — not a substitute for official National Weather Service forecasts or emergency weather warnings.