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Weather & Climate in Duncan, AZ
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Duncan enjoys a temperate climate with an average annual temperature of 61°F (16°C). Winters average 43°F in January while summers reach 82°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 10.4 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 3,786 feet.
Temperature
43°F Jan (6°C)
82°F Jul (28°C)
| Annual Average | 61.4°F |
| 14% above US avg | |
| January Average | 43°F (6°C) |
| July Average | 82°F (28°C) |
| Sunny Days | 330 days/yr |
Geography
| Elevation | 3,786 ft (1,154 m) |
| Area | 2.2 sq mi (5.6 km²) |
| Population Density | 494/sq mi |
| Coordinates | 32.7500°N, 109.0884°W |
| Timezone | America/Phoenix |
| County | Graham County County |
| Nearest Airport | Safford Regional (SAD) 33 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 45.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Relatively Low |
| Risk Score | 64.6 / 100 |
| Social Vulnerability | 71.6 / 100 |
| Community Resilience | 7.8 / 100 |
Hazard Breakdown
| Tornado | Very Low |
| Hurricane | Very Low |
| Earthquake | Very Low |
| Wildfire | Relatively Moderate |
| Flood | Relatively Low |
| Hail | Very Low |
| Strong Wind | Very Low |
| Heat Wave | Relatively Moderate |
| Winter Weather | Relatively Moderate |
| Lightning | Relatively High |
| Drought | Relatively Moderate |
| Cold Wave | Very Low |
| Landslide | Very Low |
| Avalanche | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Earthquake History
67 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M5.3.
| Jun 29, 2014 | 13 km SW of Franklin, Arizona | M5.3 | 20 km | 6 km |
| Jun 29, 2014 | 12 km S of Franklin, Arizona | M4.0 | 21 km | 5 km |
| Jul 3, 2014 | 11 km S of Franklin, Arizona | M3.9 | 19 km | 5 km |
| Jul 12, 2014 | 17 km S of Franklin, Arizona | M3.6 | 25 km | 5 km |
| Jul 9, 2014 | 13 km S of Franklin, Arizona | M3.6 | 22 km | 5 km |
| Jun 29, 2014 | 16 km SSW of Franklin, Arizona | M3.6 | 24 km | 5 km |
| Jul 11, 2014 | 5 km WSW of Franklin, Arizona | M3.6 | 11 km | 5 km |
| Jul 10, 2014 | 16 km S of Franklin, Arizona | M3.6 | 24 km | 5 km |
| Oct 8, 2012 | 32 km WNW of Glenwood, New Mexico | M3.6 | 73 km | 5 km |
| May 24, 2010 | 27 km NNE of Morenci, Arizona | M3.6 | 62 km | 5 km |
| Aug 5, 2021 | 24 km SSE of Animas, New Mexico | M3.6 | 118 km | 16 km |
| May 24, 2010 | 24 km NNE of Morenci, Arizona | M3.6 | 60 km | 5 km |
| Oct 29, 2012 | 35 km WNW of Glenwood, New Mexico | M3.5 | 74 km | 5 km |
| Jul 6, 2014 | Arizona | M3.5 | 21 km | 5 km |
| Jun 30, 2014 | 19 km SSW of Franklin, Arizona | M3.5 | 28 km | 5 km |
| Jun 29, 2014 | 14 km S of Franklin, Arizona | M3.5 | 22 km | 5 km |
| Jul 11, 2014 | 12 km SSW of Franklin, Arizona | M3.5 | 20 km | 5 km |
| Apr 22, 2020 | 28 km SSW of Rodeo, New Mexico | M3.5 | 130 km | 21 km |
| Jun 29, 2014 | 10 km SW of Franklin, Arizona | M3.4 | 17 km | 5 km |
| Apr 27, 2019 | 2 km WSW of Franklin, Arizona | M3.4 | 9 km | 10 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Tornado History
13 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF3. Total: 5 injuries.
| Date | Rating | Distance | Path | Fatalities |
| Oct 12, 1957 | EF3 | 87 km | 8.2 mi | 0 |
| Sep 23, 2019 | EF1 | 93 km | 1.7 mi | 0 |
| Aug 13, 1989 | EF1 | 74 km | 0.2 mi | 0 |
| Aug 19, 1979 | EF1 | 77 km | 0.1 mi | 0 |
| Jul 17, 1971 | EF1 | 89 km | 0.1 mi | 0 |
| Jun 15, 1967 | EF1 | 76 km | 0.1 mi | 0 |
| Jun 15, 1961 | EF1 | 88 km | 0.1 mi | 0 |
| Oct 7, 2015 | EF0 | 92 km | 1.7 mi | 0 |
| Jul 31, 2015 | EF0 | 59 km | 0.6 mi | 0 |
| Sep 6, 2007 | EF0 | 56 km | 3.1 mi | 0 |
| Aug 17, 1992 | EF0 | 79 km | 0.1 mi | 0 |
| Jul 31, 1979 | EF0 | 88 km | 0.1 mi | 0 |
| Sep 9, 1972 | EF0 | 94 km | 0.1 mi | 0 |
Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).
Nearby Volcanoes
1 volcano within 200 km. Closest: Red Hill (169 km).
| Name | Type | Elevation | Last Eruption | Distance |
| Red Hill | Volcanic field | 2,300 m (7,546 ft) | -9450 | 169 km |
Source: Smithsonian Institution Global Volcanism Program (GVP).
Wildfire History
20 wildfires (100+ acres) recorded within 100 km. Largest: WHITEWATER-BALDY (306,923 acres, 2012).
| Year | Name | Acres Burned | Distance |
| 2012 | WHITEWATER-BALDY | 306,923 | 80 km |
| 2011 | HORSESHOE 2 | 226,079 | 95 km |
| 2001 | UNNAMED | 151,684 | 98 km |
| 2003 | DRY LAKE COMPLEX (DRY LAKES) | 113,956 | 81 km |
| 2021 | JOHNSON | 95,808 | 75 km |
| 2011 | MILLER | 84,760 | 86 km |
| 2017 | FRYE | 54,202 | 73 km |
| 1993 | BRUSH | 39,349 | 81 km |
| 2006 | BEAR | 34,703 | 89 km |
| 2020 | COW CANYON | 33,536 | 89 km |
| 2004 | NUTALL COMPLEX (NUTALL) | 31,880 | 74 km |
| 2009 | GREASEWOOD | 24,902 | 69 km |
| 2020 | CUB | 24,489 | 84 km |
| 2021 | BEAR | 24,459 | 86 km |
| 2020 | BRINGHAM | 23,134 | 79 km |
| 2020 | GOOD | 19,507 | 87 km |
| 1995 | RHETT | 19,337 | 87 km |
| 1997 | LILLY | 18,507 | 86 km |
| 2000 | BLOODGOOD | 17,656 | 83 km |
| 2012 | GRAPEVINE | 17,542 | 74 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 43°F (6°C) | 1.0 in | Coldest |
| February | 47°F (8°C) | 0.8 in | |
| March | 52°F (11°C) | 0.6 in | |
| April | 58°F (15°C) | 0.2 in | Driest |
| May | 67°F (19°C) | 0.3 in | |
| June | 76°F (24°C) | 0.4 in | |
| July | 82°F (28°C) | 2.4 in | Warmest, Wettest |
| August | 78°F (26°C) | 2.2 in | |
| September | 73°F (23°C) | 1.5 in | |
| October | 62°F (17°C) | 1.2 in | |
| November | 50°F (10°C) | 0.8 in | |
| December | 43°F (6°C) | 1.3 in |
Duncan has a seasonal temperature swing of 39°F / from 43°F in January to 82°F in July. Total annual precipitation is 12.6 inches, with July being the wettest month (2.4") and April the driest (0.2").