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Weather & Climate in Cedarville, IL
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Cedarville experiences four distinct seasons with an average annual temperature of 48°F (9°C). Winters average 20°F in January while summers reach 72°F in July. The area gets 260 sunny days per year, above the national average. Annual precipitation totals 38.4 inches. The area receives 34.5 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 846 feet.
Temperature
20°F Jan (-7°C)
72°F Jul (22°C)
| Annual Average | 47.7°F |
| 12% below US avg | |
| January Average | 20°F (-7°C) |
| July Average | 72°F (22°C) |
| Sunny Days | 260 days/yr |
Geography
| Elevation | 846 ft (258 m) |
| Area | 0.2 sq mi (0.4 km²) |
| Population Density | 1,533/sq mi |
| Coordinates | 42.3757°N, 89.6363°W |
| Timezone | America/Chicago |
| County | Stephenson County County |
| Nearest Airport | Chicago/Rockford International (RFD) 30 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 43.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Relatively Low |
| Risk Score | 73.9 / 100 |
| Social Vulnerability | 56.7 / 100 |
| Community Resilience | 68.6 / 100 |
Hazard Breakdown
| Tornado | Relatively Moderate |
| Hurricane | Very Low |
| Earthquake | Very Low |
| Wildfire | Very Low |
| Flood | Relatively Moderate |
| Hail | Relatively Moderate |
| Strong Wind | Relatively High |
| Heat Wave | Relatively Low |
| Winter Weather | Relatively Low |
| Lightning | Relatively Low |
| Ice Storm | Relatively Moderate |
| Drought | Relatively Moderate |
| Cold Wave | Relatively Moderate |
| Landslide | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Earthquake History
6 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M4.2.
| Jun 28, 2004 | 12 km NW of Dayton, Illinois | M4.2 | 119 km | 10 km |
| Feb 10, 2010 | 2 km NW of Lily Lake, Illinois | M3.8 | 104 km | 10 km |
| Sep 2, 1999 | 8 km W of Amboy, Illinois | M3.5 | 75 km | 5 km |
| Jul 15, 2024 | 2 km WNW of Somonauk, Illinois | M3.1 | 111 km | 10 km |
| Mar 25, 2015 | 3 km WNW of Lake in the Hills, Illinois | M2.9 | 107 km | 6 km |
| Jun 10, 2013 | 4 km NNE of Virgil, Illinois | M2.6 | 102 km | 5 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Tornado History
563 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF5. Total: 46 fatalities, 953 injuries.
| Date | Rating | Distance | Path | Fatalities |
| Jun 7, 1984 | EF5 | 72 km | 36.0 mi | 9 |
| Apr 9, 2015 | EF4 | 65 km | 30.1 mi | 2 |
| Jul 3, 1983 | EF4 | 77 km | 0.5 mi | 0 |
| Mar 29, 1981 | EF4 | 82 km | 5.1 mi | 0 |
| Apr 21, 1967 | EF4 | 61 km | 25.5 mi | 24 |
| Jun 16, 2014 | EF3 | 70 km | 1.0 mi | 0 |
| Jan 7, 2008 | EF3 | 66 km | 13.2 mi | 0 |
| Aug 18, 2005 | EF3 | 63 km | 18.6 mi | 1 |
| Jun 19, 1993 | EF3 | 89 km | 14.0 mi | 0 |
| Jun 17, 1992 | EF3 | 57 km | 16.0 mi | 0 |
| May 8, 1988 | EF3 | 54 km | 16.0 mi | 0 |
| Aug 5, 1979 | EF3 | 40 km | 5.7 mi | 0 |
| Jun 20, 1974 | EF3 | 68 km | 10.6 mi | 1 |
| Sep 9, 1970 | EF3 | 86 km | 4.7 mi | 0 |
| Aug 2, 1967 | EF3 | 85 km | 0.1 mi | 2 |
| Apr 16, 1967 | EF3 | 29 km | 27.8 mi | 0 |
| Jan 24, 1967 | EF3 | 49 km | 7.4 mi | 0 |
| Jan 24, 1967 | EF3 | 33 km | 24.9 mi | 0 |
| Jul 15, 2024 | EF2 | 38 km | 15.4 mi | 0 |
| Jun 22, 2024 | EF2 | 45 km | 6.9 mi | 0 |
Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).
Wildfire History
2 wildfires (100+ acres) recorded within 100 km. Largest: RX-HWY Y - SOUTH (553 acres, 2024).
| Year | Name | Acres Burned | Distance |
| 2024 | RX-HWY Y - SOUTH | 553 | 98 km |
| 2009 | COLD SPRINGS | 552 | 33 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 20°F (-7°C) | 1.2 in | Coldest |
| February | 22°F (-6°C) | 1.1 in | Driest |
| March | 34°F (1°C) | 2.3 in | |
| April | 47°F (8°C) | 3.2 in | |
| May | 58°F (15°C) | 3.7 in | |
| June | 68°F (20°C) | 4.1 in | Wettest |
| July | 72°F (22°C) | 3.7 in | Warmest |
| August | 69°F (21°C) | 4.1 in | |
| September | 62°F (16°C) | 3.9 in | |
| October | 50°F (10°C) | 2.6 in | |
| November | 36°F (2°C) | 2.4 in | |
| December | 23°F (-5°C) | 1.8 in |
Cedarville has a seasonal temperature swing of 53°F / from 20°F in January to 72°F in July. Total annual precipitation is 34.1 inches, with June being the wettest month (4.1") and February the driest (1.1").