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Weather & Climate in West Sullivan, MO
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
West Sullivan experiences four distinct seasons with an average annual temperature of 55°F (13°C). Winters average 29°F in January while summers reach 77°F in July. The area gets 263 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 40.5 inches. The area receives 7.0 inches of snow annually. Air quality is rated Good with a median AQI of 41. The city sits at an elevation of 974 feet.
Temperature
29°F Jan (-1°C)
77°F Jul (25°C)
| Annual Average | 54.7°F |
| 1% above US avg | |
| January Average | 29°F (-1°C) |
| July Average | 77°F (25°C) |
| Sunny Days | 263 days/yr |
Geography
| Elevation | 974 ft (297 m) |
| Area | 0.1 sq mi (0.4 km²) |
| Population Density | 700/sq mi |
| Coordinates | 38.1923°N, 91.1926°W |
| Timezone | America/Chicago |
| Nearest Airport | Farmington Regional (FAM) 51 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 41.0 |
| Rating | Good |
Earthquake History
34 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M3.9.
| Jun 7, 2011 | 18 km NNW of Potosi, Missouri | M3.9 | 28 km | 21 km |
| Jul 31, 2005 | Missouri | M3.3 | 146 km | 5 km |
| Aug 27, 1993 | 5 km SSE of Olympian Village, Missouri | M3.3 | 67 km | 22 km |
| Jan 21, 1992 | 5 km SE of Linn Creek, Missouri | M3.1 | 131 km | 5 km |
| May 18, 2006 | 9 km SSE of De Soto, Missouri | M2.9 | 60 km | 6 km |
| Jul 8, 2003 | 1 km N of Leasburg, Missouri | M2.9 | 13 km | 4 km |
| May 21, 2012 | 6 km SW of Williamsville, Missouri | M2.9 | 150 km | 10 km |
| Apr 29, 2022 | 1 km SSW of Peerless Park, Missouri | M2.8 | 71 km | 8 km |
| May 5, 2008 | 3 km SSE of Fenton, Missouri | M2.8 | 75 km | 19 km |
| Sep 13, 1997 | 3 km SSE of Darmstadt, Illinois | M2.8 | 130 km | 16 km |
| Aug 26, 1992 | 5 km W of Frohna, Missouri | M2.8 | 146 km | 2 km |
| Jul 31, 1995 | 8 km SSW of Caledonia, Missouri | M2.8 | 65 km | 5 km |
| Nov 5, 1996 | 11 km SW of Marquand, Missouri | M2.7 | 123 km | 2 km |
| Jul 22, 1998 | 12 km NE of Mine La Motte, Missouri | M2.7 | 105 km | 11 km |
| Nov 12, 1996 | 15 km SSE of Olympian Village, Missouri | M2.7 | 73 km | 5 km |
| Jul 15, 1990 | 7 km SW of Potosi, Missouri | M2.7 | 47 km | 3 km |
| Jun 16, 1993 | 2 km SE of Longtown, Missouri | M2.7 | 140 km | 10 km |
| Oct 26, 1998 | 10 km NE of Van Buren, Missouri | M2.7 | 127 km | 4 km |
| Sep 5, 2015 | 5 km SE of High Ridge, Missouri | M2.7 | 67 km | 8 km |
| Feb 14, 2019 | 11 km WSW of Mountain View, Missouri | M2.6 | 149 km | 7 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Tornado History
441 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF4. Total: 59 fatalities, 980 injuries.
| Date | Rating | Distance | Path | Fatalities |
| Apr 22, 2011 | EF4 | 86 km | 21.3 mi | 0 |
| Jun 22, 1969 | EF4 | 28 km | 20.2 mi | 2 |
| Jun 22, 1969 | EF4 | 76 km | 15.1 mi | 4 |
| Dec 21, 1967 | EF4 | 57 km | 27.9 mi | 3 |
| Jan 24, 1967 | EF4 | 78 km | 25.0 mi | 3 |
| Feb 10, 1959 | EF4 | 64 km | 23.9 mi | 21 |
| Feb 24, 1956 | EF4 | 37 km | 77.6 mi | 6 |
| Dec 10, 2021 | EF3 | 52 km | 24.8 mi | 1 |
| Oct 24, 2021 | EF3 | 88 km | 16.7 mi | 0 |
| May 31, 2013 | EF3 | 67 km | 31.7 mi | 0 |
| Dec 31, 2010 | EF3 | 60 km | 11.0 mi | 2 |
| Dec 31, 2010 | EF3 | 71 km | 6.7 mi | 1 |
| Jan 7, 2008 | EF3 | 83 km | 1.8 mi | 0 |
| Jan 7, 2008 | EF3 | 80 km | 4.7 mi | 0 |
| Mar 13, 2006 | EF3 | 97 km | 44.5 mi | 0 |
| Mar 13, 2006 | EF3 | 74 km | 6.0 mi | 0 |
| Mar 11, 2006 | EF3 | 76 km | 5.1 mi | 0 |
| Jun 1, 1999 | EF3 | 48 km | 7.0 mi | 0 |
| Nov 15, 1988 | EF3 | 80 km | 1.0 mi | 0 |
| Apr 29, 1984 | EF3 | 88 km | 8.0 mi | 0 |
Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).
Wildfire History
20 wildfires (100+ acres) recorded within 100 km. Largest: MINNINGHAW (4,792 acres, 2011).
| Year | Name | Acres Burned | Distance |
| 2011 | MINNINGHAW | 4,792 | 82 km |
| 2017 | UNNAMED | 4,602 | 83 km |
| 2023 | ELM SPRINGS RX | 4,378 | 80 km |
| 2022 | SMITH MILL HOLLOW | 3,978 | 31 km |
| 2021 | KAINTUCK | 3,325 | 75 km |
| 2005 | UNNAMED | 3,252 | 85 km |
| 2021 | COUNCIL BLUFF | 3,035 | 58 km |
| 2022 | LITTLE CREEK | 3,004 | 85 km |
| 2021 | HODGE HOLLOW | 2,922 | 81 km |
| 2024 | COUNCIL BLUFF WEST RX | 2,846 | 58 km |
| 2005 | UNNAMED | 2,831 | 75 km |
| 2005 | UNNAMED | 2,751 | 50 km |
| 2019 | UNNAMED | 2,688 | 28 km |
| 2010 | COUNCIL BLUFF LAKE | 2,651 | 58 km |
| 2022 | MINNINGHAW | 2,516 | 81 km |
| 2006 | UNNAMED | 2,512 | 58 km |
| 2021 | THOMPSON HOLLOW | 2,479 | 89 km |
| 2019 | UNNAMED | 2,399 | 85 km |
| 2024 | KAINTUCK SOUTH RX | 2,387 | 77 km |
| 2024 | UNNAMED | 2,335 | 81 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 29°F (-1°C) | 1.9 in | Coldest, Driest |
| February | 35°F (2°C) | 2.1 in | |
| March | 45°F (7°C) | 3.6 in | |
| April | 55°F (13°C) | 3.8 in | |
| May | 64°F (18°C) | 4.6 in | Wettest |
| June | 72°F (22°C) | 3.9 in | |
| July | 77°F (25°C) | 3.7 in | Warmest |
| August | 76°F (24°C) | 3.5 in | |
| September | 68°F (20°C) | 3.7 in | |
| October | 57°F (14°C) | 3.3 in | |
| November | 45°F (7°C) | 3.5 in | |
| December | 34°F (1°C) | 3.0 in |
West Sullivan has a seasonal temperature swing of 48°F / from 29°F in January to 77°F in July. Total annual precipitation is 40.5 inches, with May being the wettest month (4.6") and January the driest (1.9").