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Weather & Climate in Hardin, IL
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Hardin experiences four distinct seasons with an average annual temperature of 54°F (12°C). Winters average 29°F in January while summers reach 76°F in July. The area gets 293 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 41.3 inches. The area receives 16.3 inches of snow annually, a moderate snowfall amount. Air quality is rated Good with a median AQI of 43. The city sits at an elevation of 459 feet.
Temperature
29°F Jan (-2°C)
76°F Jul (25°C)
| Annual Average | 54.0°F |
| 0% below US avg | |
| January Average | 29°F (-2°C) |
| July Average | 76°F (25°C) |
| Sunny Days | 293 days/yr |
Geography
| Elevation | 459 ft (140 m) |
| Area | 2.3 sq mi (6.0 km²) |
| Population Density | 372/sq mi |
| Coordinates | 39.1590°N, 90.6231°W |
| Timezone | America/Chicago |
| County | Calhoun County County |
| Nearest Airport | St Louis Lambert International (STL) 31 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 43.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Very Low |
| Risk Score | 6.1 / 100 |
| Social Vulnerability | 17.8 / 100 |
| Community Resilience | 75.0 / 100 |
Hazard Breakdown
| Tornado | Very Low |
| Hurricane | Very Low |
| Earthquake | Very Low |
| Wildfire | Very Low |
| Flood | Very Low |
| Hail | Very Low |
| Strong Wind | Very Low |
| Heat Wave | Relatively Low |
| Winter Weather | Very Low |
| Lightning | Very Low |
| Ice Storm | Very Low |
| Drought | Relatively Low |
| Cold Wave | Very Low |
| Landslide | Relatively Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Earthquake History
23 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 | 123 km | 21 km |
| Mar 2, 1990 | 9 km NW of Vernon, Illinois | M3.4 | 130 km | 0 km |
| Aug 27, 1993 | 5 km SSE of Olympian Village, Missouri | M3.3 | 120 km | 22 km |
| Jan 29, 1993 | 7 km WNW of Brownstown, Illinois | M3.2 | 138 km | 5 km |
| Jul 1, 2017 | 9 km SSE of Mulberry Grove, Illinois | M3.1 | 125 km | 17 km |
| Jul 8, 2003 | 1 km N of Leasburg, Missouri | M2.9 | 131 km | 4 km |
| May 18, 2006 | 9 km SSE of De Soto, Missouri | M2.9 | 123 km | 6 km |
| Feb 8, 2004 | 6 km SSW of Stoutsville, Missouri | M2.9 | 115 km | 5 km |
| Apr 29, 2022 | 1 km SSW of Peerless Park, Missouri | M2.8 | 71 km | 8 km |
| Mar 28, 2024 | 1 km NNE of Germantown, Illinois | M2.8 | 115 km | 24 km |
| May 5, 2008 | 3 km SSE of Fenton, Missouri | M2.8 | 77 km | 19 km |
| Sep 13, 1997 | 3 km SSE of Darmstadt, Illinois | M2.8 | 125 km | 16 km |
| Jul 15, 1990 | 7 km SW of Potosi, Missouri | M2.7 | 144 km | 3 km |
| Nov 12, 1996 | 15 km SSE of Olympian Village, Missouri | M2.7 | 130 km | 5 km |
| Sep 5, 2015 | 5 km SE of High Ridge, Missouri | M2.7 | 82 km | 8 km |
| Nov 25, 2013 | 8 km NE of Bonne Terre, Missouri | M2.6 | 132 km | 12 km |
| Feb 3, 2014 | 18 km NW of Potosi, Missouri | M2.6 | 125 km | 14 km |
| Mar 7, 2009 | 7 km S of Miramiguoa Park, Missouri | M2.6 | 116 km | 7 km |
| Jun 6, 2017 | 8 km ENE of Bonne Terre, Missouri | M2.6 | 136 km | 25 km |
| Sep 11, 2019 | 6 km NNE of Bonne Terre, Missouri | M2.6 | 132 km | 7 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Tornado History
578 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF4. Total: 50 fatalities, 1,011 injuries.
| Date | Rating | Distance | Path | Fatalities |
| Apr 22, 2011 | EF4 | 49 km | 21.3 mi | 0 |
| Apr 3, 1981 | EF4 | 65 km | 11.9 mi | 0 |
| Jan 24, 1967 | EF4 | 54 km | 25.0 mi | 3 |
| Feb 10, 1959 | EF4 | 70 km | 23.9 mi | 21 |
| Feb 24, 1956 | EF4 | 83 km | 77.6 mi | 6 |
| Dec 10, 2021 | EF3 | 66 km | 4.2 mi | 6 |
| Dec 10, 2021 | EF3 | 67 km | 24.8 mi | 1 |
| May 31, 2013 | EF3 | 57 km | 10.6 mi | 0 |
| May 31, 2013 | EF3 | 54 km | 31.7 mi | 0 |
| Apr 19, 2011 | EF3 | 76 km | 4.3 mi | 0 |
| Dec 31, 2010 | EF3 | 75 km | 6.7 mi | 1 |
| Mar 13, 2006 | EF3 | 69 km | 6.0 mi | 0 |
| Mar 13, 2006 | EF3 | 66 km | 44.5 mi | 0 |
| Jun 1, 1999 | EF3 | 84 km | 10.0 mi | 1 |
| Nov 15, 1988 | EF3 | 41 km | 1.0 mi | 0 |
| Nov 15, 1988 | EF3 | 81 km | 9.0 mi | 0 |
| Apr 29, 1984 | EF3 | 35 km | 8.0 mi | 0 |
| May 1, 1983 | EF3 | 72 km | 16.0 mi | 0 |
| May 1, 1983 | EF3 | 34 km | 4.0 mi | 0 |
| Apr 7, 1980 | EF3 | 49 km | 7.3 mi | 0 |
Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 29°F (-2°C) | 1.7 in | Coldest, Driest |
| February | 33°F (0°C) | 1.9 in | |
| March | 43°F (6°C) | 3.3 in | |
| April | 54°F (12°C) | 3.7 in | |
| May | 64°F (18°C) | 4.1 in | Wettest |
| June | 72°F (22°C) | 3.5 in | |
| July | 76°F (25°C) | 3.8 in | Warmest |
| August | 75°F (24°C) | 3.3 in | |
| September | 68°F (20°C) | 3.4 in | |
| October | 56°F (14°C) | 2.8 in | |
| November | 44°F (7°C) | 3.2 in | |
| December | 32°F (0°C) | 2.8 in |
Hardin has a seasonal temperature swing of 48°F / from 29°F in January to 76°F in July. Total annual precipitation is 37.3 inches, with May being the wettest month (4.1") and January the driest (1.7").