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Weather & Climate in Twin Grove, IL
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Twin Grove experiences four distinct seasons with an average annual temperature of 50°F (10°C). Winters average 23°F in January while summers reach 74°F in July. The area gets 275 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 40.4 inches. Air quality is rated Good with a median AQI of 43. The city sits at an elevation of 751 feet.
Temperature
23°F Jan (-5°C)
74°F Jul (23°C)
| Annual Average | 50.2°F |
| 7% below US avg | |
| January Average | 23°F (-5°C) |
| July Average | 74°F (23°C) |
| Sunny Days | 275 days/yr |
Geography
| Elevation | 751 ft (229 m) |
| Area | 4.0 sq mi (10.3 km²) |
| Population Density | 392/sq mi |
| Coordinates | 40.4793°N, 89.1015°W |
| Timezone | America/Chicago |
| County | Tazewell County County |
| Nearest Airport | Central Il Regional/Bloomington-Normal (BMI) 10 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 43.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Relatively Moderate |
| Risk Score | 84.2 / 100 |
| Social Vulnerability | 23.2 / 100 |
| Community Resilience | 94.5 / 100 |
Hazard Breakdown
| Tornado | Relatively High |
| Hurricane | Very Low |
| Earthquake | Relatively Low |
| Wildfire | Very Low |
| Flood | Relatively Moderate |
| Hail | Relatively Moderate |
| Strong Wind | Relatively High |
| Heat Wave | Relatively Moderate |
| Winter Weather | Relatively Moderate |
| Lightning | Relatively Moderate |
| Ice Storm | Relatively Moderate |
| Drought | Relatively Moderate |
| Cold Wave | Relatively High |
| Landslide | Relatively Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Earthquake History
5 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 | 110 km | 10 km |
| Sep 2, 1999 | 8 km W of Amboy, Illinois | M3.5 | 141 km | 5 km |
| May 13, 2025 | 7 km SSW of Lerna, Illinois | M3.3 | 141 km | 10 km |
| Jul 15, 2024 | 2 km WNW of Somonauk, Illinois | M3.1 | 134 km | 10 km |
| Mar 15, 2025 | 6 km W of Dwight, Illinois | M2.6 | 84 km | 5 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Tornado History
763 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF4. Total: 32 fatalities, 801 injuries.
| Date | Rating | Distance | Path | Fatalities |
| Nov 17, 2013 | EF4 | 43 km | 46.4 mi | 3 |
| Jul 13, 2004 | EF4 | 41 km | 9.6 mi | 0 |
| May 5, 1977 | EF4 | 28 km | 7.3 mi | 0 |
| Jun 29, 1976 | EF4 | 65 km | 4.9 mi | 0 |
| Mar 20, 1976 | EF4 | 80 km | 63.7 mi | 0 |
| Jun 14, 1957 | EF4 | 96 km | 4.3 mi | 2 |
| Feb 28, 2017 | EF3 | 53 km | 17.8 mi | 0 |
| Feb 28, 2017 | EF3 | 95 km | 11.5 mi | 2 |
| Nov 17, 2013 | EF3 | 84 km | 29.8 mi | 0 |
| Nov 17, 2013 | EF3 | 97 km | 18.7 mi | 0 |
| Dec 31, 2010 | EF3 | 85 km | 3.6 mi | 0 |
| Jun 5, 2010 | EF3 | 76 km | 8.6 mi | 0 |
| Aug 19, 2009 | EF3 | 70 km | 24.3 mi | 0 |
| Apr 20, 2004 | EF3 | 87 km | 15.8 mi | 8 |
| May 10, 2003 | EF3 | 49 km | 17.5 mi | 0 |
| Apr 19, 1996 | EF3 | 28 km | 9.4 mi | 0 |
| Apr 19, 1996 | EF3 | 85 km | 4.0 mi | 0 |
| Apr 19, 1996 | EF3 | 74 km | 14.5 mi | 0 |
| May 13, 1995 | EF3 | 70 km | 25.0 mi | 0 |
| May 9, 1995 | EF3 | 85 km | 50.0 mi | 0 |
Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 23°F (-5°C) | 1.7 in | Coldest |
| February | 28°F (-2°C) | 1.6 in | Driest |
| March | 40°F (4°C) | 3.1 in | |
| April | 51°F (11°C) | 3.8 in | |
| May | 62°F (17°C) | 4.3 in | Wettest |
| June | 71°F (22°C) | 3.9 in | |
| July | 74°F (23°C) | 4.0 in | Warmest |
| August | 73°F (23°C) | 3.6 in | |
| September | 66°F (19°C) | 3.7 in | |
| October | 54°F (12°C) | 2.8 in | |
| November | 41°F (5°C) | 2.8 in | |
| December | 29°F (-2°C) | 2.8 in |
Twin Grove has a seasonal temperature swing of 51°F / from 23°F in January to 74°F in July. Total annual precipitation is 37.9 inches, with May being the wettest month (4.3") and February the driest (1.6").