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Weather & Climate in Casa Grande, AZ
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Casa Grande has a warm climate with an average annual temperature of 72°F (22°C). Winters average 54°F in January while summers reach 93°F in July. The area gets 330 sunny days per year, well above the U.S. average of 205 / making it one of the sunnier locations in the country. Annual precipitation totals 7.9 inches (drier than the 38-inch national average). Air quality is rated Good with a median AQI of 45. The city sits at an elevation of 1,385 feet.
Temperature
54°F Jan (12°C)
93°F Jul (34°C)
| Annual Average | 72.4°F |
| 34% above US avg | |
| January Average | 54°F (12°C) |
| July Average | 93°F (34°C) |
| Sunny Days | 330 days/yr |
Geography
| Elevation | 1,385 ft (422 m) |
| Area | 113.9 sq mi (295.0 km²) |
| Population Density | 506/sq mi |
| Coordinates | 32.9069°N, 111.7635°W |
| Timezone | America/Phoenix |
| County | Pinal County County |
| Nearest Airport | Phoenix Sky Harbor International (PHX) 39 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 45.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Relatively Moderate |
| Risk Score | 93.8 / 100 |
| Social Vulnerability | 43.7 / 100 |
| Community Resilience | 13.9 / 100 |
Hazard Breakdown
| Tornado | Relatively Low |
| Hurricane | Very Low |
| Earthquake | Relatively Low |
| Wildfire | Relatively High |
| Flood | Relatively High |
| Hail | Relatively Moderate |
| Strong Wind | Relatively Moderate |
| Heat Wave | Relatively High |
| Winter Weather | Very Low |
| Lightning | Very High |
| Drought | Relatively High |
| Cold Wave | Very Low |
| Landslide | Very Low |
| Avalanche | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Earthquake History
11 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M3.1.
| May 9, 2009 | 11 km SSW of Cordes Lakes, Arizona | M3.1 | 149 km | 5 km |
| Jun 25, 2010 | 8 km SW of Roosevelt, Arizona | M3.1 | 94 km | 5 km |
| Sep 28, 2023 | 21 km E of Tanque Verde, Arizona | M3.1 | 140 km | 12 km |
| Sep 9, 2014 | 6 km SE of Roosevelt, Arizona | M2.9 | 101 km | 3 km |
| Aug 30, 2014 | 8 km W of Rock House, Arizona | M2.9 | 106 km | 3 km |
| Sep 26, 2010 | 3 km NNW of Roosevelt, Arizona | M2.8 | 105 km | 5 km |
| Jun 6, 2020 | 5 km NW of New River, Arizona | M2.6 | 122 km | 5 km |
| Feb 25, 2022 | 1 km S of Roosevelt, Arizona | M2.6 | 102 km | 5 km |
| Aug 9, 2025 | 14 km ENE of Willow Canyon, Arizona | M2.6 | 125 km | 12 km |
| Feb 15, 2022 | 6 km S of Roosevelt, Arizona | M2.5 | 98 km | 10 km |
| Feb 12, 2022 | 2 km ESE of Roosevelt, Arizona | M2.5 | 103 km | 5 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Tornado History
96 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF2. Total: 72 injuries.
| Date | Rating | Distance | Path | Fatalities |
| Jul 28, 1994 | EF2 | 91 km | 2.0 mi | 0 |
| Jan 17, 1993 | EF2 | 80 km | 2.1 mi | 0 |
| Jun 21, 1972 | EF2 | 66 km | 13.5 mi | 0 |
| Sep 14, 1971 | EF2 | 77 km | 0.1 mi | 0 |
| Aug 30, 1971 | EF2 | 54 km | 4.7 mi | 0 |
| Oct 3, 1968 | EF2 | 89 km | 0.1 mi | 0 |
| Jul 4, 1968 | EF2 | 55 km | 0.1 mi | 0 |
| Feb 13, 1995 | EF1 | 50 km | 0.5 mi | 0 |
| Jan 18, 1993 | EF1 | 27 km | 2.0 mi | 0 |
| May 23, 1992 | EF1 | 70 km | 0.5 mi | 0 |
| Jan 6, 1992 | EF1 | 70 km | 1.2 mi | 0 |
| Aug 24, 1991 | EF1 | 71 km | 1.0 mi | 0 |
| Jul 20, 1988 | EF1 | 28 km | 0.5 mi | 0 |
| Nov 18, 1986 | EF1 | 60 km | 0.5 mi | 0 |
| Mar 15, 1985 | EF1 | 24 km | 0.1 mi | 0 |
| Aug 9, 1984 | EF1 | 86 km | 0.5 mi | 0 |
| Jul 22, 1984 | EF1 | 15 km | 1.0 mi | 0 |
| Aug 16, 1983 | EF1 | 63 km | 0.3 mi | 0 |
| Aug 8, 1983 | EF1 | 77 km | 0.2 mi | 0 |
| Sep 5, 1981 | EF1 | 30 km | 2.0 mi | 0 |
Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).
Wildfire History
20 wildfires (100+ acres) recorded within 100 km. Largest: TELEGRAPH (187,248 acres, 2021).
| Year | Name | Acres Burned | Distance |
| 2021 | TELEGRAPH | 187,248 | 86 km |
| 2019 | WOODBURY | 130,242 | 87 km |
| 1996 | LONE | 60,574 | 96 km |
| 2024 | FREEMAN | 32,950 | 77 km |
| 2024 | SAND STONE | 26,470 | 98 km |
| 2020 | SAWTOOTH | 23,174 | 69 km |
| 1995 | RIO | 22,666 | 88 km |
| 2024 | SIPHON | 15,019 | 70 km |
| 1993 | SPRINGS | 13,472 | 81 km |
| 1995 | RIVER | 11,707 | 82 km |
| 2005 | UNNAMED | 9,537 | 88 km |
| 1988 | JACKET | 9,025 | 99 km |
| 2024 | BLACK | 8,941 | 98 km |
| 2020 | SUPERSTITION | 8,169 | 68 km |
| 2005 | PEACHVILLE | 8,086 | 80 km |
| 2017 | PINAL | 7,971 | 98 km |
| 2005 | VEKOL | 7,349 | 42 km |
| 2024 | ROMERO | 7,285 | 76 km |
| 2024 | WOOD | 7,074 | 69 km |
| 1995 | MONTEZUMA | 6,732 | 60 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 54°F (12°C) | 0.8 in | |
| February | 56°F (13°C) | 0.8 in | |
| March | 61°F (16°C) | 0.9 in | |
| April | 68°F (20°C) | 0.3 in | |
| May | 76°F (25°C) | 0.2 in | |
| June | 86°F (30°C) | 0.1 in | Driest |
| July | 93°F (34°C) | 1.1 in | Warmest |
| August | 89°F (32°C) | 1.5 in | Wettest |
| September | 84°F (29°C) | 0.8 in | |
| October | 73°F (23°C) | 0.8 in | |
| November | 60°F (16°C) | 0.7 in | |
| December | 52°F (11°C) | 1.1 in | Coldest |
Casa Grande has a seasonal temperature swing of 40°F / from 52°F in December to 93°F in July. Total annual precipitation is 9.1 inches, with August being the wettest month (1.5") and June the driest (0.1").