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Weather & Climate in Irondale, MO
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Irondale 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 259 sunny days per year, above the national average. Annual precipitation totals 42.5 inches. The area receives 8.1 inches of snow annually. Air quality is rated Good with a median AQI of 41. The city sits at an elevation of 814 feet.
Temperature
30°F Jan (-1°C)
77°F Jul (25°C)
| Annual Average | 54.6°F |
| 1% above US avg | |
| January Average | 30°F (-1°C) |
| July Average | 77°F (25°C) |
| Sunny Days | 259 days/yr |
Geography
| Elevation | 814 ft (248 m) |
| Area | 0.5 sq mi (1.4 km²) |
| Population Density | 1,008/sq mi |
| Coordinates | 37.8320°N, 90.6782°W |
| Timezone | America/Chicago |
| Nearest Airport | Farmington Regional (FAM) 15 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 41.0 |
| Rating | Good |
Earthquake History
65 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 | 121 km | 1 km |
| Feb 5, 1994 | 2 km WNW of Dongola, Illinois | M4.2 | 141 km | 16 km |
| Jul 7, 1991 | 11 km ENE of Brandsville, Missouri | M3.9 | 150 km | 8 km |
| Jun 7, 2011 | 18 km NNW of Potosi, Missouri | M3.9 | 34 km | 21 km |
| Aug 16, 2003 | 5 km W of Thomasville, Missouri | M3.7 | 141 km | 0 km |
| Sep 22, 2011 | 6 km E of Grandin, Missouri | M3.6 | 113 km | 11 km |
| Aug 27, 1993 | 5 km SSE of Olympian Village, Missouri | M3.3 | 36 km | 22 km |
| Dec 27, 1992 | 2 km E of Pocahontas, Missouri | M3.2 | 101 km | 10 km |
| Apr 6, 1994 | 2 km NE of Tamaroa, Illinois | M3.2 | 133 km | 15 km |
| Mar 12, 2002 | 6 km S of Marble Hill, Missouri | M3.1 | 91 km | 10 km |
| Jun 27, 2005 | 6 km E of Grand Tower, Illinois | M3.0 | 113 km | 10 km |
| Feb 28, 1994 | 5 km NW of Harrison, Illinois | M3.0 | 115 km | 5 km |
| Mar 18, 1990 | 9 km W of Alton, Missouri | M3.0 | 146 km | 1 km |
| Jun 27, 2025 | 12 km WSW of Grandin, Missouri | M2.9 | 121 km | 10 km |
| Jul 8, 2003 | 1 km N of Leasburg, Missouri | M2.9 | 62 km | 4 km |
| May 21, 2012 | 6 km SW of Williamsville, Missouri | M2.9 | 101 km | 10 km |
| May 18, 2006 | 9 km SSE of De Soto, Missouri | M2.9 | 28 km | 6 km |
| Apr 29, 2022 | 1 km SSW of Peerless Park, Missouri | M2.8 | 79 km | 8 km |
| Mar 28, 2024 | 1 km NNE of Germantown, Illinois | M2.8 | 129 km | 24 km |
| Jul 31, 1995 | 8 km SSW of Caledonia, Missouri | M2.8 | 20 km | 5 km |
Source: USGS Earthquake Catalog (M2.5+, 1990-2025). Sorted by magnitude.
Tornado History
473 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF4. Total: 75 fatalities, 1,079 injuries.
| Date | Rating | Distance | Path | Fatalities |
| Feb 28, 2017 | EF4 | 60 km | 53.5 mi | 1 |
| Sep 22, 2006 | EF4 | 77 km | 27.5 mi | 0 |
| Apr 24, 2002 | EF4 | 97 km | 40.5 mi | 0 |
| Jun 22, 1969 | EF4 | 16 km | 15.1 mi | 4 |
| Jun 22, 1969 | EF4 | 39 km | 20.2 mi | 2 |
| Dec 21, 1967 | EF4 | 43 km | 27.9 mi | 3 |
| Jan 24, 1967 | EF4 | 95 km | 25.0 mi | 3 |
| Feb 10, 1959 | EF4 | 78 km | 23.9 mi | 21 |
| Feb 24, 1956 | EF4 | 72 km | 77.6 mi | 6 |
| Dec 10, 2021 | EF3 | 88 km | 24.8 mi | 1 |
| Oct 24, 2021 | EF3 | 28 km | 16.7 mi | 0 |
| Oct 24, 2021 | EF3 | 41 km | 18.8 mi | 0 |
| May 31, 2013 | EF3 | 95 km | 31.7 mi | 0 |
| Dec 31, 2010 | EF3 | 99 km | 11.0 mi | 2 |
| Dec 31, 2010 | EF3 | 76 km | 6.7 mi | 1 |
| Mar 11, 2006 | EF3 | 60 km | 53.5 mi | 2 |
| Mar 11, 2006 | EF3 | 44 km | 5.1 mi | 0 |
| Apr 27, 2002 | EF3 | 87 km | 4.0 mi | 1 |
| Jun 1, 1999 | EF3 | 90 km | 7.0 mi | 0 |
| Apr 19, 1996 | EF3 | 72 km | 11.5 mi | 0 |
Source: NOAA Storm Prediction Center (EF0+, 1950-2024, US only).
Wildfire History
20 wildfires (100+ acres) recorded within 100 km. Largest: STEGALL MOUNTAIN (6,979 acres, 2022).
| Year | Name | Acres Burned | Distance |
| 2022 | STEGALL MOUNTAIN | 6,979 | 95 km |
| 2015 | 15 STEGAL MOUNTAIN | 5,112 | 95 km |
| 2011 | MINNINGHAW | 4,792 | 72 km |
| 2009 | STEGAL MTN. COMPLEX | 4,717 | 95 km |
| 2017 | UNNAMED | 4,602 | 72 km |
| 2022 | SMITH MILL HOLLOW | 3,978 | 32 km |
| 1999 | STEGALL99 | 3,415 | 96 km |
| 2013 | UNNAMED | 3,313 | 100 km |
| 2005 | UNNAMED | 3,252 | 74 km |
| 2021 | COUNCIL BLUFF | 3,035 | 26 km |
| 2022 | LITTLE CREEK | 3,004 | 73 km |
| 2013 | UNNAMED | 2,963 | 91 km |
| 2021 | HODGE HOLLOW | 2,922 | 74 km |
| 2024 | COUNCIL BLUFF WEST RX | 2,846 | 26 km |
| 2004 | 04 RX CAMPBELL/BEAVER | 2,772 | 93 km |
| 2005 | UNNAMED | 2,751 | 26 km |
| 2005 | MCKENZIE HILL | 2,722 | 70 km |
| 2019 | UNNAMED | 2,688 | 36 km |
| 2010 | COUNCIL BLUFF LAKE | 2,651 | 26 km |
| 2019 | PECK RANCH | 2,598 | 97 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 30°F (-1°C) | 2.2 in | Coldest, Driest |
| February | 35°F (2°C) | 2.4 in | |
| March | 45°F (7°C) | 4.1 in | |
| April | 55°F (13°C) | 4.1 in | |
| May | 63°F (17°C) | 4.5 in | Wettest |
| June | 72°F (22°C) | 3.5 in | |
| July | 77°F (25°C) | 3.6 in | Warmest |
| August | 75°F (24°C) | 3.8 in | |
| September | 68°F (20°C) | 3.6 in | |
| October | 57°F (14°C) | 3.0 in | |
| November | 45°F (7°C) | 4.2 in | |
| December | 35°F (2°C) | 3.5 in |
Irondale has a seasonal temperature swing of 47°F / from 30°F in January to 77°F in July. Total annual precipitation is 42.5 inches, with May being the wettest month (4.5") and January the driest (2.2").