Pima County Climate
Pima County, Arizona
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
68.1°F
Annual Precip
13.4"
Annual Snowfall
0.8"
Extreme Heat Days
139
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
9a
Minimum winter temperature range for plant survival
6,865
Excellent for heat-loving crops
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: Pima County
Climate Verdict
Pima County has a warm, averaging 68.1°F year-round, arid conditions receiving just 13.4 inches of precipitation annually, extreme heat exposure with 139.09999999999997 days per year above 90°F, light snow averaging 0.8 inches per year. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are mild, with January temperatures averaging 51.8°F. summers are hot, with July averaging 85.4°F. The 34°F seasonal variation provides noticeable but manageable change. December is typically the coldest month and July the warmest.
Outdoor & Gardening Guidance
Summer outdoor activities should be planned for early morning or evening to avoid extreme heat.
Regional Context
Pima County is 4.6°F warmer than the Arizona statewide average of 63.5°F, the county experiences 25.68500840825837 more extreme heat days than the state average.
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 sources: NOAA National Centers for Environmental Information (NCEI), U.S. Climate Normals 1991-2020. Forecast and alert data from National Weather Service API. Air quality data from Open-Meteo.
Climate normals are 30-year averages of weather variables. Station data is aggregated to county level. Forecasts and alerts are fetched live and may change frequently. Data is informational only — not a substitute for official National Weather Service forecasts or emergency weather warnings.