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Weather & Climate in Mammoth Spring, AR
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Mammoth Spring enjoys a temperate climate with an average annual temperature of 57°F (14°C). Winters average 35°F in January while summers reach 78°F in July. The area gets 305 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 48.8 inches (wetter than the 38-inch national average). Air quality is rated Good with a median AQI of 43. The city sits at an elevation of 569 feet.
Temperature
35°F Jan (2°C)
78°F Jul (26°C)
| Annual Average | 57.4°F |
| 6% above US avg | |
| January Average | 35°F (2°C) |
| July Average | 78°F (26°C) |
| Sunny Days | 305 days/yr |
Geography
| Elevation | 569 ft (173 m) |
| Area | 1.4 sq mi (3.6 km²) |
| Population Density | 675/sq mi |
| Coordinates | 36.4924°N, 91.5411°W |
| Timezone | America/Chicago |
| County | Oregon County County |
| Nearest Airport | Sharp County Regional (CKK) 16 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 43.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Relatively Low |
| Risk Score | 48.7 / 100 |
| Social Vulnerability | 76.0 / 100 |
| Community Resilience | 1.9 / 100 |
Hazard Breakdown
| Tornado | Relatively Low |
| Hurricane | Very Low |
| Earthquake | Relatively Low |
| Wildfire | Very Low |
| Flood | Relatively Low |
| Hail | Very Low |
| Strong Wind | Relatively Low |
| Heat Wave | Relatively Low |
| Winter Weather | Relatively Low |
| Lightning | Relatively Low |
| Ice Storm | Relatively Moderate |
| Drought | No Rating |
| Cold Wave | Relatively Moderate |
| Landslide | Relatively Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Earthquake History
156 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M4.2.
| May 1, 2005 | 5 km SSE of Manila, Arkansas | M4.2 | 145 km | 10 km |
| Feb 10, 2005 | 3 km NNW of Etowah, Arkansas | M4.1 | 142 km | 15 km |
| Oct 21, 1999 | 9 km NW of Maynard, Arkansas | M3.9 | 51 km | 10 km |
| Aug 22, 2000 | 19 km WNW of Maynard, Arkansas | M3.9 | 40 km | 10 km |
| Jul 7, 1991 | 11 km ENE of Brandsville, Missouri | M3.9 | 22 km | 8 km |
| Jun 4, 2014 | 3 km ESE of Fairfield Bay, Arkansas | M3.8 | 120 km | 0 km |
| Sep 17, 1997 | 2 km E of Trumann, Arkansas | M3.8 | 132 km | 0 km |
| Aug 16, 2003 | 5 km W of Thomasville, Missouri | M3.7 | 34 km | 0 km |
| Feb 23, 2013 | 7 km SW of Trumann, Arkansas | M3.7 | 131 km | 14 km |
| Sep 12, 2019 | 13 km N of Big Flat, Arkansas | M3.7 | 88 km | 18 km |
| Oct 15, 2017 | 6 km SE of Manila, Arkansas | M3.6 | 147 km | 17 km |
| Sep 22, 2011 | 6 km E of Grandin, Missouri | M3.6 | 79 km | 11 km |
| Jun 11, 2017 | 6 km NNE of Bergman, Arkansas | M3.6 | 130 km | 6 km |
| Jan 8, 1993 | 6 km WSW of Gosnell, Arkansas | M3.5 | 149 km | 22 km |
| Aug 20, 1994 | 4 km NE of Black Rock, Arkansas | M3.5 | 58 km | 10 km |
| Jun 27, 2000 | 15 km WSW of Marshall, Arkansas | M3.4 | 133 km | 0 km |
| Oct 5, 2011 | 5 km WSW of Quitman, Arkansas | M3.3 | 141 km | 5 km |
| Jan 20, 2010 | 4 km WNW of Lynn, Arkansas | M3.3 | 57 km | 0 km |
| Jun 26, 2010 | 10 km NW of Garner, Arkansas | M3.3 | 146 km | 0 km |
| Jul 17, 2013 | 7 km SW of Trumann, Arkansas | M3.2 | 131 km | 14 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Tornado History
394 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF4. Total: 74 fatalities, 1,004 injuries.
| Date | Rating | Distance | Path | Fatalities |
| Apr 24, 2002 | EF4 | 73 km | 40.5 mi | 0 |
| Jan 21, 1999 | EF4 | 92 km | 16.0 mi | 0 |
| Dec 24, 1982 | EF4 | 36 km | 63.0 mi | 0 |
| Apr 2, 1982 | EF4 | 61 km | 20.0 mi | 2 |
| May 15, 1968 | EF4 | 94 km | 0.3 mi | 7 |
| May 15, 1968 | EF4 | 91 km | 20.9 mi | 35 |
| May 21, 1957 | EF4 | 61 km | 9.1 mi | 7 |
| May 26, 2024 | EF3 | 62 km | 12.4 mi | 0 |
| May 25, 2011 | EF3 | 71 km | 47.4 mi | 0 |
| May 8, 2009 | EF3 | 56 km | 2.2 mi | 0 |
| Mar 1, 2007 | EF3 | 56 km | 15.0 mi | 1 |
| Apr 2, 2006 | EF3 | 59 km | 77.0 mi | 2 |
| Jan 21, 1999 | EF3 | 94 km | 31.0 mi | 0 |
| Mar 1, 1997 | EF3 | 85 km | 5.0 mi | 0 |
| Mar 1, 1997 | EF3 | 86 km | 15.0 mi | 1 |
| Mar 1, 1997 | EF3 | 89 km | 5.0 mi | 0 |
| Mar 5, 1996 | EF3 | 69 km | 46.5 mi | 0 |
| Oct 18, 1984 | EF3 | 31 km | 26.0 mi | 1 |
| Dec 2, 1982 | EF3 | 36 km | 9.0 mi | 0 |
| Apr 2, 1982 | EF3 | 52 km | 1.5 mi | 2 |
Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).
Tsunami History
1 tsunami recorded within 500 km.
| Year | Location | Cause | Max Wave | Deaths | Distance |
| 1811 | AR: NE - NEW MADRID EARTHQUAKES | Eruption + Earthquake | — | — | 143 km |
Source: NOAA/NCEI Historical Tsunami Database.
Wildfire History
20 wildfires (100+ acres) recorded within 100 km. Largest: HANDY (12,818 acres, 2012).
| Year | Name | Acres Burned | Distance |
| 2012 | HANDY | 12,818 | 54 km |
| 2007 | DEAD HORSE | 10,389 | 92 km |
| 2004 | LOWER WILD | 10,034 | 92 km |
| 2011 | UNNAMED | 9,641 | 53 km |
| 2022 | CEDAR BLUFF | 9,617 | 53 km |
| 2013 | LOWER WILDERNESS RX | 8,699 | 93 km |
| 2020 | BIG BARREN CREEK | 8,150 | 57 km |
| 2022 | STEGALL MOUNTAIN | 6,979 | 73 km |
| 2021 | SYL BIRMINGHAM | 6,803 | 84 km |
| 2010 | WYLIE KING 1 | 6,077 | 99 km |
| 2015 | 15 STEGAL MOUNTAIN | 5,112 | 72 km |
| 2021 | ROCK PILE | 5,067 | 65 km |
| 2018 | UNNAMED | 4,873 | 85 km |
| 2024 | BRIDGES RX | 4,781 | 55 km |
| 2009 | STEGAL MTN. COMPLEX | 4,717 | 72 km |
| 2019 | UNNAMED | 4,493 | 76 km |
| 2014 | UNNAMED | 4,337 | 77 km |
| 2021 | MILLER KING | 4,130 | 97 km |
| 2016 | UNNAMED | 3,807 | 85 km |
| 2024 | RX BAD BRANCH 2 | 3,591 | 80 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 35°F (2°C) | 2.7 in | Coldest, Driest |
| February | 40°F (4°C) | 3.0 in | |
| March | 49°F (9°C) | 4.5 in | |
| April | 58°F (15°C) | 4.3 in | |
| May | 66°F (19°C) | 4.3 in | |
| June | 74°F (23°C) | 3.6 in | |
| July | 78°F (26°C) | 3.2 in | Warmest |
| August | 78°F (25°C) | 3.3 in | |
| September | 70°F (21°C) | 3.9 in | |
| October | 59°F (15°C) | 3.5 in | |
| November | 48°F (9°C) | 4.7 in | Wettest |
| December | 38°F (3°C) | 4.1 in |
Mammoth Spring has a seasonal temperature swing of 44°F / from 35°F in January to 78°F in July. Total annual precipitation is 45.2 inches, with November being the wettest month (4.7") and January the driest (2.7").