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Weather & Climate in Iron Mountain Lake, MO
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Iron Mountain Lake 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 258 sunny days per year, above the national average. Annual precipitation totals 42.8 inches. The area receives 8.2 inches of snow annually. Air quality is rated Good with a median AQI of 41. The city sits at an elevation of 1,050 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 | 258 days/yr |
Geography
| Elevation | 1,050 ft (320 m) |
| Area | 2.1 sq mi (5.4 km²) |
| Population Density | 403/sq mi |
| Coordinates | 37.6891°N, 90.6186°W |
| Timezone | America/Chicago |
| Nearest Airport | Farmington Regional (FAM) 14 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 41.0 |
| Rating | Good |
Earthquake History
116 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 | 107 km | 1 km |
| May 4, 1991 | 2 km NNW of Risco, Missouri | M4.5 | 143 km | 11 km |
| Feb 5, 1994 | 2 km WNW of Dongola, Illinois | M4.2 | 131 km | 16 km |
| Jun 7, 2011 | 18 km NNW of Potosi, Missouri | M3.9 | 50 km | 21 km |
| Jul 7, 1991 | 11 km ENE of Brandsville, Missouri | M3.9 | 140 km | 8 km |
| Feb 21, 2012 | 4 km SSE of Bertrand, Missouri | M3.9 | 139 km | 8 km |
| Aug 22, 2000 | 19 km WNW of Maynard, Arkansas | M3.9 | 142 km | 10 km |
| Oct 21, 1999 | 9 km NW of Maynard, Arkansas | M3.9 | 138 km | 10 km |
| Aug 16, 2003 | 5 km W of Thomasville, Missouri | M3.7 | 132 km | 0 km |
| Sep 22, 2011 | 6 km E of Grandin, Missouri | M3.6 | 98 km | 11 km |
| Jun 15, 2004 | 3 km S of Canalou, Missouri | M3.5 | 135 km | 5 km |
| Aug 27, 1993 | 5 km SSE of Olympian Village, Missouri | M3.3 | 47 km | 22 km |
| Feb 6, 1993 | 6 km NNW of Catron, Missouri | M3.3 | 138 km | 8 km |
| Dec 27, 1992 | 2 km E of Pocahontas, Missouri | M3.2 | 91 km | 10 km |
| Apr 6, 1994 | 2 km NE of Tamaroa, Illinois | M3.2 | 134 km | 15 km |
| Oct 21, 1999 | 10 km NW of Maynard, Arkansas | M3.1 | 138 km | 9 km |
| May 15, 2014 | 4 km W of Malden, Missouri | M3.1 | 137 km | 6 km |
| Mar 31, 1993 | 3 km WNW of East Prairie, Missouri | M3.1 | 145 km | 4 km |
| Mar 12, 2002 | 6 km S of Marble Hill, Missouri | M3.1 | 76 km | 10 km |
| May 30, 2010 | 7 km S of Catron, Missouri | M3.1 | 150 km | 9 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Tornado History
454 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF4. Total: 74 fatalities, 868 injuries.
| Date | Rating | Distance | Path | Fatalities |
| Feb 28, 2017 | EF4 | 54 km | 53.5 mi | 1 |
| Sep 22, 2006 | EF4 | 69 km | 27.5 mi | 0 |
| Apr 24, 2002 | EF4 | 84 km | 40.5 mi | 0 |
| Jun 22, 1969 | EF4 | 8 km | 15.1 mi | 4 |
| Jun 22, 1969 | EF4 | 51 km | 20.2 mi | 2 |
| Dec 21, 1967 | EF4 | 45 km | 27.9 mi | 3 |
| Feb 10, 1959 | EF4 | 94 km | 23.9 mi | 21 |
| May 21, 1957 | EF4 | 96 km | 9.1 mi | 7 |
| Feb 24, 1956 | EF4 | 89 km | 77.6 mi | 6 |
| Oct 24, 2021 | EF3 | 19 km | 16.7 mi | 0 |
| Oct 24, 2021 | EF3 | 26 km | 18.8 mi | 0 |
| Feb 29, 2012 | EF3 | 96 km | 20.0 mi | 1 |
| May 25, 2011 | EF3 | 99 km | 47.4 mi | 0 |
| Dec 31, 2010 | EF3 | 90 km | 6.7 mi | 1 |
| Mar 11, 2006 | EF3 | 56 km | 53.5 mi | 2 |
| Mar 11, 2006 | EF3 | 54 km | 5.1 mi | 0 |
| May 6, 2003 | EF3 | 90 km | 2.0 mi | 0 |
| Apr 27, 2002 | EF3 | 71 km | 4.0 mi | 1 |
| Jun 1, 1999 | EF3 | 99 km | 7.0 mi | 0 |
| Apr 19, 1996 | EF3 | 66 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 | 84 km |
| 2010 | WYLIE KING 1 | 6,077 | 88 km |
| 2015 | 15 STEGAL MOUNTAIN | 5,112 | 85 km |
| 2011 | MINNINGHAW | 4,792 | 69 km |
| 2009 | STEGAL MTN. COMPLEX | 4,717 | 85 km |
| 2017 | UNNAMED | 4,602 | 69 km |
| 2021 | MILLER KING | 4,130 | 86 km |
| 2022 | SMITH MILL HOLLOW | 3,978 | 45 km |
| 1999 | STEGALL99 | 3,415 | 85 km |
| 2013 | UNNAMED | 3,313 | 84 km |
| 2005 | UNNAMED | 3,252 | 70 km |
| 2021 | VICTORY 1-7 | 3,237 | 91 km |
| 2021 | COUNCIL BLUFF | 3,035 | 28 km |
| 2022 | LITTLE CREEK | 3,004 | 70 km |
| 2013 | UNNAMED | 2,963 | 79 km |
| 2021 | HODGE HOLLOW | 2,922 | 71 km |
| 2024 | COUNCIL BLUFF WEST RX | 2,846 | 28 km |
| 2004 | 04 RX CAMPBELL/BEAVER | 2,772 | 82 km |
| 2005 | UNNAMED | 2,751 | 32 km |
| 2005 | MCKENZIE HILL | 2,722 | 56 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) | 4.2 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) | 3.9 in | |
| September | 68°F (20°C) | 3.6 in | |
| October | 57°F (14°C) | 3.0 in | |
| November | 45°F (7°C) | 4.3 in | |
| December | 35°F (2°C) | 3.5 in |
Iron Mountain Lake has a seasonal temperature swing of 47°F / from 30°F in January to 77°F in July. Total annual precipitation is 42.7 inches, with May being the wettest month (4.5") and January the driest (2.2").