Climate change in Maricopa County, Arizona
Since 1979, Maricopa County, Arizona has warmed 2.7°F, with 16 more days above 90°F, 29 more nights above 70°F and 32% less precipitation a year. Its climate in 1996–2025 is most like La Paz County, AZ's was in 1951–1980.
- Average temperature: +2.7°F
- Summer highs (Jun–Aug): +3.1°F
- Winter lows (Dec–Feb): +0.4°F
- Precipitation: −32%
- Wettest day of the year: −12%
- Longest dry spell: +31 days
- Days above 90°F: +16 days
- Nights above 70°F: +29 days
- Freezing nights: −0 days
- Frost-free season: +1 days
- Muggy days: −4 days
- Summer heat index (Jun–Aug): +1.9°F
- Extreme fire-weather days: +23 days
Changes follow the trend line through every year from 1979 to 2025. Data: NOAA nClimGrid-Daily; humidity from gridMET, adjusted to airport observations.