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Weather & Climate in Assumption, IL
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Assumption experiences four distinct seasons with an average annual temperature of 54°F (12°C). Winters average 28°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 42.3 inches. The area receives 14.5 inches of snow annually. Air quality is rated Good with a median AQI of 43. The city sits at an elevation of 639 feet.
Temperature
28°F Jan (-2°C)
76°F Jul (25°C)
| Annual Average | 53.6°F |
| 1% below US avg | |
| January Average | 28°F (-2°C) |
| July Average | 76°F (25°C) |
| Sunny Days | 293 days/yr |
Geography
| Elevation | 639 ft (195 m) |
| Area | 1.0 sq mi (2.6 km²) |
| Population Density | 1,128/sq mi |
| Coordinates | 39.5180°N, 89.0477°W |
| Timezone | America/Chicago |
| County | Christian County County |
| Nearest Airport | Central Il Regional/Bloomington-Normal (BMI) 67 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 43.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Relatively Low |
| Risk Score | 54.0 / 100 |
| Social Vulnerability | 17.1 / 100 |
| Community Resilience | 85.0 / 100 |
Hazard Breakdown
| Tornado | Relatively Low |
| Hurricane | Very Low |
| Earthquake | Relatively Low |
| Wildfire | Very Low |
| Flood | Relatively Low |
| Hail | Relatively Low |
| Strong Wind | Relatively Moderate |
| Heat Wave | Relatively Low |
| Winter Weather | Relatively Low |
| Lightning | Relatively Low |
| Ice Storm | Relatively Low |
| Drought | Relatively High |
| Cold Wave | Relatively Moderate |
| Landslide | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Earthquake History
18 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M3.8.
| Nov 11, 1991 | 3 km W of Flat Rock, Illinois | M3.8 | 134 km | 0 km |
| Mar 2, 1990 | 9 km NW of Vernon, Illinois | M3.4 | 75 km | 0 km |
| May 30, 2015 | 4 km ENE of Geff, Illinois | M3.4 | 132 km | 26 km |
| May 13, 2025 | 7 km SSW of Lerna, Illinois | M3.3 | 64 km | 10 km |
| Jan 29, 1993 | 7 km WNW of Brownstown, Illinois | M3.2 | 54 km | 5 km |
| Oct 24, 1990 | 5 km ENE of Woodlawn, Illinois | M3.2 | 131 km | 1 km |
| Jul 1, 2017 | 9 km SSE of Mulberry Grove, Illinois | M3.1 | 76 km | 17 km |
| Dec 16, 1996 | 3 km NNE of Terre Haute, Indiana | M3.1 | 141 km | 5 km |
| Sep 5, 2004 | 3 km WNW of Saint Peter, Illinois | M2.9 | 72 km | 33 km |
| Sep 5, 1995 | 3 km N of Woodlawn, Illinois | M2.9 | 129 km | 4 km |
| Apr 24, 1990 | 5 km SW of Newton, Illinois | M2.9 | 96 km | 18 km |
| Mar 28, 2024 | 1 km NNE of Germantown, Illinois | M2.8 | 113 km | 24 km |
| Sep 13, 1997 | 3 km SSE of Darmstadt, Illinois | M2.8 | 148 km | 16 km |
| Sep 10, 2023 | 9 km E of Parkersburg, Illinois | M2.7 | 140 km | 21 km |
| Sep 14, 2011 | 8 km NW of Mount Erie, Illinois | M2.7 | 124 km | 28 km |
| Apr 16, 1991 | 4 km E of Parkersburg, Illinois | M2.7 | 137 km | 7 km |
| Jun 16, 2022 | 4 km ESE of Parkersburg, Illinois | M2.5 | 138 km | 20 km |
| May 17, 2022 | 6 km NNW of Mount Vernon, Illinois | M2.5 | 128 km | 16 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Tornado History
682 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF4. Total: 23 fatalities, 578 injuries.
| Date | Rating | Distance | Path | Fatalities |
| Jun 2, 1990 | EF4 | 92 km | 12.5 mi | 0 |
| May 5, 1977 | EF4 | 83 km | 7.3 mi | 0 |
| Mar 20, 1976 | EF4 | 38 km | 63.7 mi | 0 |
| Jun 14, 1957 | EF4 | 62 km | 4.3 mi | 2 |
| Dec 1, 2018 | EF3 | 32 km | 12.5 mi | 0 |
| Nov 17, 2013 | EF3 | 71 km | 18.7 mi | 0 |
| Apr 19, 2011 | EF3 | 67 km | 4.3 mi | 0 |
| Dec 31, 2010 | EF3 | 87 km | 3.6 mi | 0 |
| Aug 19, 2009 | EF3 | 66 km | 24.3 mi | 0 |
| Jun 1, 1999 | EF3 | 58 km | 10.0 mi | 1 |
| Apr 19, 1996 | EF3 | 92 km | 4.0 mi | 0 |
| Apr 19, 1996 | EF3 | 93 km | 9.4 mi | 0 |
| Apr 19, 1996 | EF3 | 35 km | 14.5 mi | 0 |
| May 9, 1995 | EF3 | 71 km | 50.0 mi | 0 |
| Jul 26, 1978 | EF3 | 70 km | 8.9 mi | 0 |
| Aug 21, 1977 | EF3 | 36 km | 26.9 mi | 6 |
| Aug 6, 1977 | EF3 | 59 km | 4.1 mi | 0 |
| Jul 28, 1976 | EF3 | 93 km | 0.1 mi | 0 |
| Mar 20, 1976 | EF3 | 55 km | 8.8 mi | 0 |
| Aug 10, 1974 | EF3 | 77 km | 0.1 mi | 0 |
Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 28°F (-2°C) | 2.0 in | Coldest, Driest |
| February | 30°F (-1°C) | 2.0 in | |
| March | 42°F (5°C) | 3.4 in | |
| April | 53°F (12°C) | 3.9 in | |
| May | 64°F (18°C) | 4.3 in | Wettest |
| June | 73°F (23°C) | 4.1 in | |
| July | 76°F (25°C) | 4.0 in | Warmest |
| August | 74°F (23°C) | 3.4 in | |
| September | 67°F (20°C) | 3.1 in | |
| October | 55°F (13°C) | 2.8 in | |
| November | 43°F (6°C) | 3.4 in | |
| December | 31°F (-0°C) | 2.9 in |
Assumption has a seasonal temperature swing of 48°F / from 28°F in January to 76°F in July. Total annual precipitation is 39.3 inches, with May being the wettest month (4.3") and January the driest (2.0").