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Weather & Climate in Southwest City, MO
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Southwest City enjoys a temperate climate with an average annual temperature of 58°F (14°C). Winters average 34°F in January while summers reach 79°F in July. The area gets 255 sunny days per year, above the national average. Annual precipitation totals 44.8 inches. The area receives 1.9 inches of snow annually. Air quality is rated Good with a median AQI of 41. The city sits at an elevation of 938 feet.
Temperature
34°F Jan (1°C)
79°F Jul (26°C)
| Annual Average | 57.8°F |
| 7% above US avg | |
| January Average | 34°F (1°C) |
| July Average | 79°F (26°C) |
| Sunny Days | 255 days/yr |
Geography
| Elevation | 938 ft (286 m) |
| Area | 1.5 sq mi (3.9 km²) |
| Population Density | 579/sq mi |
| Coordinates | 36.5129°N, 94.6116°W |
| Timezone | America/Chicago |
| Nearest Airport | Grand Lake Regional (NRI) 15 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 41.0 |
| Rating | Good |
Earthquake History
10 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M3.6.
| Jun 11, 2017 | 6 km NNE of Bergman, Arkansas | M3.6 | 146 km | 6 km |
| Jun 16, 2017 | 6 km N of Bergman, Arkansas | M2.9 | 145 km | 6 km |
| Mar 23, 2024 | 9 km SE of Foyil, Oklahoma | M2.8 | 77 km | 5 km |
| Jan 14, 2016 | 7 km W of Talala, Oklahoma | M2.7 | 104 km | 5 km |
| Apr 3, 2016 | Arkansas-Oklahoma border region | M2.7 | 99 km | 5 km |
| Sep 3, 2015 | 6 km WSW of Vera, Oklahoma | M2.6 | 120 km | 5 km |
| May 21, 2010 | 2 km SW of Centerton, Arkansas | M2.6 | 33 km | 1 km |
| Jun 21, 2017 | 6 km N of Bergman, Arkansas | M2.5 | 145 km | 5 km |
| Apr 29, 2010 | 3 km SW of Centerton, Arkansas | M2.5 | 33 km | 0 km |
| Aug 11, 2011 | 11 km WSW of Jasper, Arkansas | M2.5 | 131 km | 4 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Tornado History
709 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF5. Total: 220 fatalities, 2,200 injuries.
| Date | Rating | Distance | Path | Fatalities |
| May 22, 2011 | EF5 | 60 km | 21.6 mi | 158 |
| May 10, 2008 | EF4 | 72 km | 75.5 mi | 21 |
| Apr 26, 1991 | EF4 | 99 km | 4.0 mi | 0 |
| Apr 24, 1975 | EF4 | 35 km | 11.9 mi | 3 |
| Sep 27, 1959 | EF4 | 68 km | 20.4 mi | 1 |
| Apr 3, 1956 | EF4 | 43 km | 41.8 mi | 0 |
| May 25, 2024 | EF3 | 24 km | 7.9 mi | 0 |
| Mar 30, 2022 | EF3 | 60 km | 5.2 mi | 0 |
| May 22, 2019 | EF3 | 66 km | 9.2 mi | 0 |
| May 22, 2019 | EF3 | 95 km | 11.3 mi | 3 |
| May 22, 2011 | EF3 | 26 km | 17.9 mi | 0 |
| Dec 31, 2010 | EF3 | 57 km | 21.1 mi | 4 |
| Mar 12, 2006 | EF3 | 32 km | 25.0 mi | 0 |
| Mar 12, 2006 | EF3 | 63 km | 29.0 mi | 0 |
| Mar 12, 2006 | EF3 | 89 km | 42.0 mi | 1 |
| May 4, 2003 | EF3 | 58 km | 49.0 mi | 7 |
| May 4, 2003 | EF3 | 70 km | 25.0 mi | 5 |
| Jun 1, 1999 | EF3 | 83 km | 2.0 mi | 2 |
| Nov 22, 1983 | EF3 | 75 km | 19.0 mi | 0 |
| Mar 15, 1982 | EF3 | 92 km | 30.0 mi | 1 |
Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).
Wildfire History
20 wildfires (100+ acres) recorded within 100 km. Largest: TELAMAY HOLLOW (5,686 acres, 2009).
| Year | Name | Acres Burned | Distance |
| 2009 | TELAMAY HOLLOW | 5,686 | 58 km |
| 2009 | SAWMILL HOLLOW | 5,166 | 55 km |
| 1992 | UNNAMED | 4,546 | 48 km |
| 2005 | FLAT ROCK | 4,472 | 77 km |
| 2004 | UNNAMED | 4,424 | 92 km |
| 1995 | F128 | 4,210 | 55 km |
| 2024 | NATURE FIRE | 3,744 | 56 km |
| 1986 | UNNAMED | 3,427 | 44 km |
| 2011 | UNNAMED | 3,285 | 93 km |
| 2007 | UNNAMED | 3,160 | 37 km |
| 2006 | HUNT MILL HOLLOW FIRE | 3,080 | 92 km |
| 2016 | RXBURN | 2,951 | 45 km |
| 1996 | UNNAMED | 2,918 | 48 km |
| 2021 | BRUSH CREEK | 2,814 | 21 km |
| 2018 | UNNAMED | 2,776 | 90 km |
| 2023 | RX WHISKEY SPRINGS 3 | 2,716 | 90 km |
| 2021 | BLACKBURN | 2,711 | 90 km |
| 2011 | CEDAR BLUFF | 2,693 | 97 km |
| 2004 | UNNAMED | 2,661 | 37 km |
| 1992 | UNNAMED | 2,648 | 96 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 34°F (1°C) | 1.9 in | Coldest, Driest |
| February | 40°F (4°C) | 2.2 in | |
| March | 49°F (9°C) | 3.9 in | |
| April | 58°F (14°C) | 4.3 in | |
| May | 66°F (19°C) | 5.1 in | Wettest |
| June | 74°F (23°C) | 4.7 in | |
| July | 79°F (26°C) | 3.2 in | Warmest |
| August | 78°F (26°C) | 3.5 in | |
| September | 71°F (21°C) | 5.0 in | |
| October | 60°F (15°C) | 3.9 in | |
| November | 48°F (9°C) | 4.2 in | |
| December | 38°F (3°C) | 2.9 in |
Southwest City has a seasonal temperature swing of 45°F / from 34°F in January to 79°F in July. Total annual precipitation is 44.8 inches, with May being the wettest month (5.1") and January the driest (1.9").