Weather & Climate in Divernon, IL
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Divernon experiences four distinct seasons with an average annual temperature of 55°F (13°C). Winters average 29°F in January while summers reach 77°F in July. Annual precipitation totals 38.4 inches. The area receives 16.1 inches of snow annually, a moderate snowfall amount. Air quality is rated Good with a median AQI of 41. 72% of days have good air quality. The city sits at an elevation of 610 feet.
Temperature
29°F Jan (-2°C)
77°F Jul (25°C)
| Annual Average | 54.8°F |
| 1% above US avg | |
| January Average | 29°F (-2°C) |
| July Average | 77°F (25°C) |
Geography
| Elevation | 610 ft (186 m) |
| Area | 0.3 sq mi (0.8 km²) |
| Population Density | 1,661/sq mi |
| Coordinates | 39.5704°N, 89.6536°W |
| Timezone | America/Chicago |
| County | Sangamon County County |
| Nearest Airport | St Louis Regional (ALN) 51 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 41.0 |
| Rating | Good |
| Good Days % | 71.9% |
| Unhealthy Days | 1 |
Natural Hazard Risk
| Overall Risk | Relatively Moderate |
| Risk Score | 91.7 / 100 |
| Social Vulnerability | 32.0 / 100 |
| Community Resilience | 92.2 / 100 |
Hazard Breakdown
| Tornado | Relatively High |
| Hurricane | Very Low |
| Earthquake | Relatively Moderate |
| Wildfire | Very Low |
| Flood | Relatively Moderate |
| Hail | Relatively High |
| Strong Wind | Relatively High |
| Heat Wave | Relatively Moderate |
| Winter Weather | Relatively High |
| Lightning | Relatively High |
| Ice Storm | Relatively Moderate |
| Drought | Relatively High |
| Cold Wave | Relatively High |
| Landslide | Relatively Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Earthquake History
16 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M3.4.
| Mar 2, 1990 | 9 km NW of Vernon, Illinois | M3.4 | 90 km | 0 km |
| May 13, 2025 | 7 km SSW of Lerna, Illinois | M3.3 | 116 km | 10 km |
| Jan 29, 1993 | 7 km WNW of Brownstown, Illinois | M3.2 | 80 km | 5 km |
| Oct 24, 1990 | 5 km ENE of Woodlawn, Illinois | M3.2 | 148 km | 1 km |
| Jul 1, 2017 | 9 km SSE of Mulberry Grove, Illinois | M3.1 | 88 km | 17 km |
| Sep 5, 1995 | 3 km N of Woodlawn, Illinois | M2.9 | 145 km | 4 km |
| Sep 5, 2004 | 3 km WNW of Saint Peter, Illinois | M2.9 | 101 km | 33 km |
| Apr 24, 1990 | 5 km SW of Newton, Illinois | M2.9 | 143 km | 18 km |
| Apr 29, 2022 | 1 km SSW of Peerless Park, Missouri | M2.8 | 137 km | 8 km |
| Mar 28, 2024 | 1 km NNE of Germantown, Illinois | M2.8 | 112 km | 24 km |
| May 5, 2008 | 3 km SSE of Fenton, Missouri | M2.8 | 137 km | 19 km |
| Sep 13, 1997 | 3 km SSE of Darmstadt, Illinois | M2.8 | 143 km | 16 km |
| Sep 5, 2015 | 5 km SE of High Ridge, Missouri | M2.7 | 146 km | 8 km |
| Sep 19, 2024 | 1 km S of Old Monroe, Missouri | M2.6 | 119 km | 2 km |
| May 17, 2022 | 6 km NNW of Mount Vernon, Illinois | M2.5 | 147 km | 16 km |
| Jan 15, 1998 | 1 km SSE of Fenton, Missouri | M2.5 | 137 km | 16 km |
Source: USGS Earthquake Catalog (M2.5+, 1990-2025). Sorted by magnitude.
Tornado History
675 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF4. Total: 31 fatalities, 631 injuries.
| Date | Rating | Distance | Path | Fatalities |
| May 5, 1977 | EF4 | 83 km | 7.3 mi | 0 |
| Mar 20, 1976 | EF4 | 77 km | 63.7 mi | 0 |
| Jun 14, 1957 | EF4 | 20 km | 4.3 mi | 2 |
| Dec 10, 2021 | EF3 | 97 km | 4.2 mi | 6 |
| Dec 1, 2018 | EF3 | 28 km | 12.5 mi | 0 |
| May 31, 2013 | EF3 | 96 km | 10.6 mi | 0 |
| Apr 19, 2011 | EF3 | 20 km | 4.3 mi | 0 |
| Dec 31, 2010 | EF3 | 49 km | 3.6 mi | 0 |
| Aug 19, 2009 | EF3 | 44 km | 24.3 mi | 0 |
| Jun 1, 1999 | EF3 | 28 km | 10.0 mi | 1 |
| Apr 19, 1996 | EF3 | 87 km | 9.4 mi | 0 |
| Apr 19, 1996 | EF3 | 49 km | 14.5 mi | 0 |
| May 13, 1995 | EF3 | 97 km | 25.0 mi | 0 |
| May 9, 1995 | EF3 | 35 km | 50.0 mi | 0 |
| May 1, 1983 | EF3 | 61 km | 4.0 mi | 0 |
| Jul 26, 1978 | EF3 | 28 km | 8.9 mi | 0 |
| Aug 21, 1977 | EF3 | 88 km | 26.9 mi | 6 |
| Aug 6, 1977 | EF3 | 9 km | 4.1 mi | 0 |
| Jul 28, 1976 | EF3 | 82 km | 0.1 mi | 0 |
| Mar 20, 1976 | EF3 | 17 km | 8.8 mi | 0 |
Source: NOAA Storm Prediction Center (EF0+, 1950-2024, US only).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 29°F (-2°C) | 2.0 in | Coldest, Driest |
| February | 33°F (1°C) | 2.3 in | |
| March | 44°F (7°C) | 2.5 in | |
| April | 56°F (13°C) | 4.2 in | |
| May | 65°F (19°C) | 4.2 in | |
| June | 74°F (23°C) | 4.3 in | Wettest |
| July | 77°F (25°C) | 3.5 in | Warmest |
| August | 76°F (24°C) | 3.1 in | |
| September | 69°F (21°C) | 3.4 in | |
| October | 57°F (14°C) | 3.4 in | |
| November | 44°F (7°C) | 3.1 in | |
| December | 34°F (1°C) | 2.4 in |
Divernon has a seasonal temperature swing of 49°F / from 29°F in January to 77°F in July. Total annual precipitation is 38.4 inches, with June being the wettest month (4.3") and January the driest (2.0").