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Weather & Climate in Ironton, MO
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Ironton experiences four distinct seasons with an average annual temperature of 55°F (13°C). Winters average 30°F in January while summers reach 77°F in July. The area gets 257 sunny days per year, above the national average. Annual precipitation totals 43.5 inches. The area receives 8.6 inches of snow annually. Air quality is rated Good with a median AQI of 41. The city sits at an elevation of 928 feet.
Temperature
30°F Jan (-1°C)
77°F Jul (25°C)
| Annual Average | 54.7°F |
| 1% above US avg | |
| January Average | 30°F (-1°C) |
| July Average | 77°F (25°C) |
| Sunny Days | 257 days/yr |
Geography
| Elevation | 928 ft (283 m) |
| Area | 1.3 sq mi (3.5 km²) |
| Population Density | 1,310/sq mi |
| Coordinates | 37.5978°N, 90.6282°W |
| Timezone | America/Chicago |
| Nearest Airport | Farmington Regional (FAM) 19 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 41.0 |
| Rating | Good |
Earthquake History
154 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M4.8.
| Sep 26, 1990 | 4 km SE of Chaffee, Missouri | M4.8 | 103 km | 1 km |
| May 4, 1991 | 2 km NNW of Risco, Missouri | M4.5 | 134 km | 11 km |
| Feb 5, 1994 | 2 km WNW of Dongola, Illinois | M4.2 | 130 km | 16 km |
| Jun 7, 2011 | 18 km NNW of Potosi, Missouri | M3.9 | 59 km | 21 km |
| Feb 21, 2012 | 4 km SSE of Bertrand, Missouri | M3.9 | 134 km | 8 km |
| Oct 21, 1999 | 9 km NW of Maynard, Arkansas | M3.9 | 128 km | 10 km |
| Aug 22, 2000 | 19 km WNW of Maynard, Arkansas | M3.9 | 132 km | 10 km |
| Jul 7, 1991 | 11 km ENE of Brandsville, Missouri | M3.9 | 131 km | 8 km |
| Mar 2, 2010 | 2 km ENE of East Prairie, Missouri | M3.7 | 144 km | 8 km |
| Aug 16, 2003 | 5 km W of Thomasville, Missouri | M3.7 | 124 km | 0 km |
| Sep 22, 2011 | 6 km E of Grandin, Missouri | M3.6 | 87 km | 11 km |
| Jun 15, 2004 | 3 km S of Canalou, Missouri | M3.5 | 128 km | 5 km |
| Aug 27, 1993 | 5 km SSE of Olympian Village, Missouri | M3.3 | 57 km | 22 km |
| Feb 6, 1993 | 6 km NNW of Catron, Missouri | M3.3 | 131 km | 8 km |
| Sep 27, 2019 | 4 km WSW of Howardville, Missouri | M3.3 | 145 km | 8 km |
| Nov 9, 1990 | 2 km NW of Marston, Missouri | M3.2 | 147 km | 10 km |
| Dec 27, 1992 | 2 km E of Pocahontas, Missouri | M3.2 | 90 km | 10 km |
| Apr 6, 1994 | 2 km NE of Tamaroa, Illinois | M3.2 | 139 km | 15 km |
| Feb 28, 2015 | 3 km NW of Marston, Missouri | M3.1 | 147 km | 13 km |
| Feb 10, 2023 | 7 km S of Catron, Missouri | M3.1 | 142 km | 7 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Tornado History
449 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF4. Total: 55 fatalities, 551 injuries.
| Date | Rating | Distance | Path | Fatalities |
| Feb 28, 2017 | EF4 | 57 km | 53.5 mi | 1 |
| Sep 22, 2006 | EF4 | 71 km | 27.5 mi | 0 |
| Apr 24, 2002 | EF4 | 75 km | 40.5 mi | 0 |
| Jun 22, 1969 | EF4 | 57 km | 20.2 mi | 2 |
| Jun 22, 1969 | EF4 | 16 km | 15.1 mi | 4 |
| Dec 21, 1967 | EF4 | 45 km | 27.9 mi | 3 |
| May 21, 1957 | EF4 | 87 km | 9.1 mi | 7 |
| Feb 24, 1956 | EF4 | 98 km | 77.6 mi | 6 |
| Oct 24, 2021 | EF3 | 23 km | 16.7 mi | 0 |
| Oct 24, 2021 | EF3 | 22 km | 18.8 mi | 0 |
| Feb 29, 2012 | EF3 | 87 km | 20.0 mi | 1 |
| May 25, 2011 | EF3 | 89 km | 47.4 mi | 0 |
| Mar 11, 2006 | EF3 | 64 km | 5.1 mi | 0 |
| Mar 11, 2006 | EF3 | 61 km | 53.5 mi | 2 |
| May 6, 2003 | EF3 | 88 km | 2.0 mi | 0 |
| Apr 27, 2002 | EF3 | 65 km | 4.0 mi | 1 |
| Apr 19, 1996 | EF3 | 68 km | 11.5 mi | 0 |
| May 29, 1982 | EF3 | 97 km | 10.0 mi | 0 |
| Apr 22, 1981 | EF3 | 66 km | 7.1 mi | 1 |
| Feb 21, 1976 | EF3 | 99 km | 23.7 mi | 1 |
Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).
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 | 94 km |
| 2011 | UNNAMED | 9,641 | 98 km |
| 2022 | CEDAR BLUFF | 9,617 | 96 km |
| 2020 | BIG BARREN CREEK | 8,150 | 91 km |
| 2022 | STEGALL MOUNTAIN | 6,979 | 76 km |
| 2010 | WYLIE KING 1 | 6,077 | 78 km |
| 2015 | 15 STEGAL MOUNTAIN | 5,112 | 76 km |
| 2011 | MINNINGHAW | 4,792 | 65 km |
| 2024 | BRIDGES RX | 4,781 | 98 km |
| 2009 | STEGAL MTN. COMPLEX | 4,717 | 76 km |
| 2017 | UNNAMED | 4,602 | 65 km |
| 2021 | MILLER KING | 4,130 | 76 km |
| 2022 | SMITH MILL HOLLOW | 3,978 | 52 km |
| 1999 | STEGALL99 | 3,415 | 77 km |
| 2013 | UNNAMED | 3,313 | 74 km |
| 2005 | UNNAMED | 3,252 | 66 km |
| 2021 | VICTORY 1-7 | 3,237 | 81 km |
| 1988 | HANES 1 | 3,139 | 97 km |
| 2021 | COUNCIL BLUFF | 3,035 | 30 km |
| 2011 | MUD POND | 3,030 | 93 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 30°F (-1°C) | 2.3 in | Coldest, Driest |
| February | 35°F (2°C) | 2.6 in | |
| March | 45°F (7°C) | 4.3 in | |
| April | 55°F (13°C) | 4.2 in | |
| May | 63°F (17°C) | 4.5 in | Wettest |
| June | 71°F (22°C) | 3.5 in | |
| July | 77°F (25°C) | 3.7 in | Warmest |
| August | 75°F (24°C) | 3.9 in | |
| September | 68°F (20°C) | 3.6 in | |
| October | 57°F (14°C) | 2.9 in | |
| November | 45°F (7°C) | 4.3 in | |
| December | 35°F (2°C) | 3.7 in |
Ironton has a seasonal temperature swing of 47°F / from 30°F in January to 77°F in July. Total annual precipitation is 43.5 inches, with May being the wettest month (4.5") and January the driest (2.3").