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Weather & Climate in Le Roy, IL
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Le Roy experiences four distinct seasons with an average annual temperature of 51°F (11°C). Winters average 25°F in January while summers reach 75°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 39.4 inches. The area receives 20.1 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 772 feet.
Temperature
25°F Jan (-4°C)
75°F Jul (24°C)
| Annual Average | 51.1°F |
| 5% below US avg | |
| January Average | 25°F (-4°C) |
| July Average | 75°F (24°C) |
| Sunny Days | 275 days/yr |
Geography
| Elevation | 772 ft (235 m) |
| Area | 2.4 sq mi (6.2 km²) |
| Population Density | 1,324/sq mi |
| Coordinates | 40.3394°N, 88.7611°W |
| Timezone | America/Chicago |
| County | McLean County County |
| Nearest Airport | Central Il Regional/Bloomington-Normal (BMI) 13 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 43.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Relatively Moderate |
| Risk Score | 86.9 / 100 |
| Social Vulnerability | 15.1 / 100 |
| Community Resilience | 95.5 / 100 |
Hazard Breakdown
| Tornado | Relatively Moderate |
| Hurricane | Very Low |
| Earthquake | Relatively Low |
| Wildfire | Very Low |
| Flood | Relatively Moderate |
| Hail | Relatively Moderate |
| Strong Wind | Relatively Moderate |
| Heat Wave | Relatively Moderate |
| Winter Weather | Relatively High |
| Lightning | Relatively Moderate |
| Ice Storm | Relatively Moderate |
| Drought | Relatively High |
| Cold Wave | Relatively High |
| Landslide | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Earthquake History
8 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 | 125 km | 10 km |
| Jun 17, 2021 | Illinois-Indiana border region | M3.8 | 138 km | 6 km |
| May 13, 2025 | 7 km SSW of Lerna, Illinois | M3.3 | 115 km | 10 km |
| Jan 29, 1993 | 7 km WNW of Brownstown, Illinois | M3.2 | 147 km | 5 km |
| Dec 17, 1990 | Illinois-Indiana border region | M3.2 | 149 km | 10 km |
| Jul 15, 2024 | 2 km WNW of Somonauk, Illinois | M3.1 | 145 km | 10 km |
| Dec 16, 1996 | 3 km NNE of Terre Haute, Indiana | M3.1 | 149 km | 5 km |
| Mar 15, 2025 | 6 km W of Dwight, Illinois | M2.6 | 86 km | 5 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Tornado History
787 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF4. Total: 17 fatalities, 724 injuries.
| Date | Rating | Distance | Path | Fatalities |
| Nov 17, 2013 | EF4 | 75 km | 46.4 mi | 3 |
| Jul 13, 2004 | EF4 | 70 km | 9.6 mi | 0 |
| May 5, 1977 | EF4 | 43 km | 7.3 mi | 0 |
| Jun 29, 1976 | EF4 | 98 km | 4.9 mi | 0 |
| Mar 20, 1976 | EF4 | 60 km | 63.7 mi | 0 |
| Feb 28, 2017 | EF3 | 81 km | 17.8 mi | 0 |
| Nov 17, 2013 | EF3 | 67 km | 18.7 mi | 0 |
| Nov 17, 2013 | EF3 | 52 km | 29.8 mi | 0 |
| Jun 5, 2010 | EF3 | 85 km | 8.6 mi | 0 |
| Aug 19, 2009 | EF3 | 80 km | 24.3 mi | 0 |
| May 10, 2003 | EF3 | 79 km | 17.5 mi | 0 |
| Apr 19, 1996 | EF3 | 50 km | 9.4 mi | 0 |
| Apr 19, 1996 | EF3 | 73 km | 2.0 mi | 1 |
| Apr 19, 1996 | EF3 | 68 km | 14.5 mi | 0 |
| Apr 19, 1996 | EF3 | 53 km | 4.0 mi | 0 |
| May 13, 1995 | EF3 | 99 km | 25.0 mi | 0 |
| May 9, 1995 | EF3 | 97 km | 50.0 mi | 0 |
| Apr 3, 1974 | EF3 | 76 km | 20.9 mi | 1 |
| Apr 3, 1974 | EF3 | 60 km | 5.9 mi | 1 |
| Apr 3, 1974 | EF3 | 73 km | 14.9 mi | 0 |
Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 25°F (-4°C) | 1.7 in | Coldest |
| February | 28°F (-2°C) | 1.6 in | Driest |
| March | 39°F (4°C) | 3.2 in | |
| April | 51°F (10°C) | 3.8 in | |
| May | 62°F (17°C) | 4.1 in | Wettest |
| June | 71°F (22°C) | 3.7 in | |
| July | 75°F (24°C) | 4.0 in | Warmest |
| August | 72°F (22°C) | 3.7 in | |
| September | 65°F (19°C) | 3.5 in | |
| October | 54°F (12°C) | 2.7 in | |
| November | 41°F (5°C) | 2.9 in | |
| December | 29°F (-2°C) | 2.8 in |
Le Roy has a seasonal temperature swing of 50°F / from 25°F in January to 75°F in July. Total annual precipitation is 37.6 inches, with May being the wettest month (4.1") and February the driest (1.6").