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Weather & Climate in Keyesport, IL
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Keyesport enjoys a temperate climate with an average annual temperature of 56°F (13°C). Winters average 30°F in January while summers reach 78°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 45.9 inches (wetter than the 38-inch national average). Air quality is rated Good with a median AQI of 43. The city sits at an elevation of 460 feet.
Temperature
30°F Jan (-1°C)
78°F Jul (26°C)
| Annual Average | 55.7°F |
| 3% above US avg | |
| January Average | 30°F (-1°C) |
| July Average | 78°F (26°C) |
| Sunny Days | 293 days/yr |
Geography
| Elevation | 460 ft (140 m) |
| Area | 0.3 sq mi (0.7 km²) |
| Population Density | 853/sq mi |
| Coordinates | 38.7464°N, 89.2738°W |
| Timezone | America/Chicago |
| County | Clinton County County |
| Nearest Airport | St Louis Regional (ALN) 43 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 43.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Relatively Low |
| Risk Score | 65.6 / 100 |
| Social Vulnerability | 27.6 / 100 |
| Community Resilience | 88.8 / 100 |
Hazard Breakdown
| Tornado | Relatively Moderate |
| Hurricane | Very Low |
| Earthquake | Relatively Moderate |
| Wildfire | Very Low |
| Flood | Relatively Low |
| Hail | Relatively Low |
| Strong Wind | Relatively High |
| Heat Wave | Relatively Low |
| Winter Weather | Relatively Low |
| Lightning | Relatively Low |
| Ice Storm | Very Low |
| Drought | Relatively Low |
| Cold Wave | Relatively Moderate |
| Landslide | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Earthquake History
67 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M5.2.
| Apr 18, 2008 | 7 km NNE of Bellmont, Illinois | M5.2 | 125 km | 14 km |
| Apr 18, 2008 | 9 km NNE of Bellmont, Illinois | M4.7 | 126 km | 15 km |
| Apr 21, 2008 | 7 km NNE of Bellmont, Illinois | M4.0 | 126 km | 18 km |
| Sep 19, 2017 | 4 km N of Bellmont, Illinois | M3.8 | 124 km | 12 km |
| Nov 11, 1991 | 3 km W of Flat Rock, Illinois | M3.8 | 137 km | 0 km |
| Apr 25, 2008 | 8 km NNE of Bellmont, Illinois | M3.7 | 126 km | 13 km |
| Nov 20, 2012 | 7 km N of Bellmont, Illinois | M3.6 | 124 km | 19 km |
| Jan 2, 2006 | 3 km NNE of Eldorado, Illinois | M3.6 | 125 km | 7 km |
| Mar 2, 1990 | 9 km NW of Vernon, Illinois | M3.4 | 15 km | 0 km |
| Jun 5, 2008 | 8 km WNW of Mount Carmel, Illinois | M3.4 | 129 km | 16 km |
| May 30, 2015 | 4 km ENE of Geff, Illinois | M3.4 | 86 km | 26 km |
| Aug 27, 1993 | 5 km SSE of Olympian Village, Missouri | M3.3 | 125 km | 22 km |
| May 1, 2008 | 8 km NNE of Bellmont, Illinois | M3.3 | 127 km | 14 km |
| May 13, 2025 | 7 km SSW of Lerna, Illinois | M3.3 | 107 km | 10 km |
| Apr 6, 1994 | 2 km NE of Tamaroa, Illinois | M3.2 | 66 km | 15 km |
| Dec 27, 1992 | 2 km E of Pocahontas, Missouri | M3.2 | 142 km | 10 km |
| May 2, 2003 | 10 km ENE of Thompsonville, Illinois | M3.2 | 102 km | 0 km |
| Oct 24, 1990 | 5 km ENE of Woodlawn, Illinois | M3.2 | 52 km | 1 km |
| Jan 29, 1993 | 7 km WNW of Brownstown, Illinois | M3.2 | 38 km | 5 km |
| Jul 1, 2017 | 9 km SSE of Mulberry Grove, Illinois | M3.1 | 12 km | 17 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Tornado History
610 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF5. Total: 40 fatalities, 569 injuries.
| Date | Rating | Distance | Path | Fatalities |
| Dec 18, 1957 | EF5 | 74 km | 5.4 mi | 1 |
| Nov 17, 2013 | EF4 | 39 km | 10.6 mi | 2 |
| Jun 2, 1990 | EF4 | 73 km | 23.0 mi | 0 |
| Jun 2, 1990 | EF4 | 90 km | 12.5 mi | 0 |
| Jun 2, 1990 | EF4 | 89 km | 106.0 mi | 1 |
| Apr 3, 1981 | EF4 | 74 km | 11.9 mi | 0 |
| Dec 18, 1957 | EF4 | 55 km | 16.8 mi | 1 |
| Dec 10, 2021 | EF3 | 68 km | 4.2 mi | 6 |
| Dec 1, 2018 | EF3 | 75 km | 12.5 mi | 0 |
| May 31, 2013 | EF3 | 76 km | 10.6 mi | 0 |
| Apr 19, 2011 | EF3 | 91 km | 4.3 mi | 0 |
| Apr 21, 2002 | EF3 | 65 km | 31.5 mi | 1 |
| Jun 1, 1999 | EF3 | 72 km | 10.0 mi | 1 |
| Apr 19, 1996 | EF3 | 81 km | 17.0 mi | 0 |
| Nov 15, 1988 | EF3 | 65 km | 9.0 mi | 0 |
| May 1, 1983 | EF3 | 77 km | 16.0 mi | 0 |
| Dec 2, 1982 | EF3 | 45 km | 10.5 mi | 2 |
| May 29, 1982 | EF3 | 87 km | 10.0 mi | 0 |
| Apr 7, 1980 | EF3 | 92 km | 7.3 mi | 0 |
| Aug 21, 1977 | EF3 | 93 km | 26.9 mi | 6 |
Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 30°F (-1°C) | 1.9 in | Coldest, Driest |
| February | 33°F (0°C) | 2.2 in | |
| March | 43°F (6°C) | 3.8 in | |
| April | 54°F (12°C) | 3.7 in | |
| May | 64°F (18°C) | 4.2 in | Wettest |
| June | 73°F (23°C) | 3.9 in | |
| July | 78°F (26°C) | 3.7 in | Warmest |
| August | 76°F (24°C) | 2.9 in | |
| September | 69°F (20°C) | 3.1 in | |
| October | 57°F (14°C) | 3.0 in | |
| November | 45°F (7°C) | 3.6 in | |
| December | 34°F (1°C) | 3.3 in |
Keyesport has a seasonal temperature swing of 48°F / from 30°F in January to 78°F in July. Total annual precipitation is 39.4 inches, with May being the wettest month (4.2") and January the driest (1.9").