Weather & Climate in Hebron, IL
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Hebron experiences four distinct seasons with an average annual temperature of 47°F (8°C). Winters average 21°F in January while summers reach 71°F in July. Annual precipitation totals 36.5 inches. The area receives 40.1 inches of snow annually, making winter weather a significant factor for residents. Air quality is rated Good with a median AQI of 43. 67% of days have good air quality. The city sits at an elevation of 925 feet.
Temperature
21°F Jan (-6°C)
71°F Jul (21°C)
| Annual Average | 47.0°F |
| 13% below US avg | |
| January Average | 21°F (-6°C) |
| July Average | 71°F (21°C) |
Geography
| Elevation | 925 ft (282 m) |
| Area | 0.8 sq mi (1.9 km²) |
| Population Density | 744/sq mi |
| Coordinates | 42.4654°N, 88.4344°W |
| Timezone | America/Chicago |
| County | McHenry County County |
| Nearest Airport | Kenosha Regional (ENW) 27 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 43.0 |
| Rating | Good |
| Good Days % | 66.9% |
| Unhealthy Days | 1 |
Natural Hazard Risk
| Overall Risk | Relatively Moderate |
| Risk Score | 90.8 / 100 |
| Social Vulnerability | 10.6 / 100 |
| Community Resilience | 84.0 / 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 Low |
| Winter Weather | Relatively Moderate |
| Lightning | Relatively Moderate |
| Ice Storm | Relatively Low |
| Drought | Relatively Low |
| Cold Wave | Relatively High |
| Landslide | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Earthquake History
7 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 | 118 km | 10 km |
| Feb 10, 2010 | 2 km NW of Lily Lake, Illinois | M3.8 | 55 km | 10 km |
| Sep 2, 1999 | 8 km W of Amboy, Illinois | M3.5 | 117 km | 5 km |
| Nov 4, 2013 | 1 km SSW of Lyons, Illinois | M3.2 | 90 km | 1 km |
| Jul 15, 2024 | 2 km WNW of Somonauk, Illinois | M3.1 | 94 km | 10 km |
| Mar 25, 2015 | 3 km WNW of Lake in the Hills, Illinois | M2.9 | 31 km | 6 km |
| Jun 10, 2013 | 4 km NNE of Virgil, Illinois | M2.6 | 53 km | 5 km |
Source: USGS Earthquake Catalog (M2.5+, 1990-2025). Sorted by magnitude.
Tornado History
546 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF5. Total: 76 fatalities, 1,686 injuries.
| Date | Rating | Distance | Path | Fatalities |
| Aug 28, 1990 | EF5 | 88 km | 16.4 mi | 29 |
| Apr 9, 2015 | EF4 | 98 km | 30.1 mi | 2 |
| Apr 27, 1984 | EF4 | 58 km | 6.5 mi | 1 |
| Jun 13, 1976 | EF4 | 95 km | 3.3 mi | 2 |
| Sep 28, 1972 | EF4 | 51 km | 5.2 mi | 0 |
| Apr 21, 1967 | EF4 | 38 km | 8.8 mi | 1 |
| Apr 21, 1967 | EF4 | 48 km | 25.5 mi | 24 |
| Apr 11, 1965 | EF4 | 28 km | 9.1 mi | 6 |
| Jun 20, 2021 | EF3 | 83 km | 17.6 mi | 0 |
| Jan 7, 2008 | EF3 | 13 km | 10.8 mi | 0 |
| Jan 7, 2008 | EF3 | 34 km | 13.2 mi | 0 |
| Aug 18, 2005 | EF3 | 96 km | 18.6 mi | 1 |
| Jun 5, 1980 | EF3 | 79 km | 10.7 mi | 0 |
| Mar 12, 1976 | EF3 | 93 km | 22.6 mi | 0 |
| Jan 24, 1967 | EF3 | 78 km | 24.9 mi | 0 |
| Jul 19, 1963 | EF3 | 20 km | 10.6 mi | 0 |
| Jun 22, 2024 | EF2 | 58 km | 6.0 mi | 0 |
| Feb 8, 2024 | EF2 | 79 km | 25.9 mi | 0 |
| Nov 22, 2010 | EF2 | 47 km | 18.1 mi | 0 |
| Jul 22, 2010 | EF2 | 48 km | 1.0 mi | 0 |
Source: NOAA Storm Prediction Center (EF0+, 1950-2024, US only).
Wildfire History
2 wildfires (100+ acres) recorded within 100 km. Largest: IBSP SOUTH F1 RX (690 acres, 2024).
| Year | Name | Acres Burned | Distance |
| 2024 | IBSP SOUTH F1 RX | 690 | 51 km |
| 2024 | RX-HWY Y - SOUTH | 553 | 61 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 21°F (-6°C) | 1.7 in | Coldest |
| February | 23°F (-5°C) | 1.5 in | Driest |
| March | 35°F (2°C) | 2.2 in | |
| April | 46°F (8°C) | 3.4 in | |
| May | 57°F (14°C) | 4.3 in | |
| June | 67°F (19°C) | 4.7 in | Wettest |
| July | 71°F (21°C) | 4.4 in | Warmest |
| August | 69°F (20°C) | 3.9 in | |
| September | 62°F (17°C) | 3.6 in | |
| October | 50°F (10°C) | 2.9 in | |
| November | 38°F (3°C) | 2.3 in | |
| December | 27°F (-3°C) | 1.6 in |
Hebron has a seasonal temperature swing of 50°F / from 21°F in January to 71°F in July. Total annual precipitation is 36.6 inches, with June being the wettest month (4.7") and February the driest (1.5").