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Weather & Climate in Hillsboro, IN
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Hillsboro experiences four distinct seasons with an average annual temperature of 51°F (10°C). Winters average 24°F in January while summers reach 73°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 40.1 inches. The area receives 23.3 inches of snow annually, a moderate snowfall amount. Air quality is rated Good with a median AQI of 41. The city sits at an elevation of 712 feet.
Temperature
24°F Jan (-4°C)
73°F Jul (23°C)
| Annual Average | 50.8°F |
| 6% below US avg | |
| January Average | 24°F (-4°C) |
| July Average | 73°F (23°C) |
| Sunny Days | 275 days/yr |
Geography
| Elevation | 712 ft (217 m) |
| Area | 0.3 sq mi (0.8 km²) |
| Population Density | 2,074/sq mi |
| Coordinates | 40.1088°N, 87.1576°W |
| Timezone | America/Indiana/Indianapolis |
| County | Fountain County County |
| Nearest Airport | Vermilion Regional (DNV) 24 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 41.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Very Low |
| Risk Score | 21.3 / 100 |
| Social Vulnerability | 28.1 / 100 |
| Community Resilience | 46.1 / 100 |
Hazard Breakdown
| Tornado | Relatively Low |
| Hurricane | Very Low |
| Earthquake | Very Low |
| Wildfire | Very Low |
| Flood | Very Low |
| Hail | Relatively Low |
| Strong Wind | Relatively Moderate |
| Heat Wave | Very Low |
| Winter Weather | Relatively Low |
| Lightning | Relatively Moderate |
| Ice Storm | Very Low |
| Drought | Relatively Low |
| Cold Wave | Relatively Moderate |
| Landslide | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Earthquake History
10 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M3.8.
| Jun 17, 2021 | Illinois-Indiana border region | M3.8 | 33 km | 6 km |
| Nov 11, 1991 | 3 km W of Flat Rock, Illinois | M3.8 | 142 km | 0 km |
| Sep 12, 2004 | 4 km NW of Manilla, Indiana | M3.8 | 140 km | 2 km |
| Dec 20, 1990 | 5 km S of Stilesville, Indiana | M3.7 | 73 km | 5 km |
| Apr 14, 2000 | 4 km NW of Heritage Lake, Indiana | M3.6 | 52 km | 5 km |
| May 13, 2025 | 7 km SSW of Lerna, Illinois | M3.3 | 130 km | 10 km |
| Dec 17, 1990 | Illinois-Indiana border region | M3.2 | 11 km | 10 km |
| May 10, 2012 | 0 km NW of Emison, Indiana | M3.1 | 147 km | 11 km |
| Dec 16, 1996 | 3 km NNE of Terre Haute, Indiana | M3.1 | 71 km | 5 km |
| May 10, 2012 | 1 km NNW of Emison, Indiana | M2.7 | 146 km | 9 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Tornado History
613 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF4. Total: 87 fatalities, 1,717 injuries.
| Date | Rating | Distance | Path | Fatalities |
| Apr 26, 1994 | EF4 | 45 km | 14.0 mi | 3 |
| Mar 20, 1976 | EF4 | 42 km | 16.7 mi | 0 |
| Apr 3, 1974 | EF4 | 44 km | 108.7 mi | 18 |
| May 14, 1972 | EF4 | 99 km | 30.0 mi | 0 |
| Apr 11, 1965 | EF4 | 37 km | 21.8 mi | 0 |
| Apr 11, 1965 | EF4 | 26 km | 45.7 mi | 28 |
| Apr 11, 1965 | EF4 | 74 km | 48.0 mi | 25 |
| Mar 31, 2023 | EF3 | 97 km | 5.9 mi | 2 |
| Aug 24, 2016 | EF3 | 91 km | 8.6 mi | 0 |
| Nov 17, 2013 | EF3 | 87 km | 29.8 mi | 0 |
| Nov 17, 2013 | EF3 | 38 km | 37.9 mi | 0 |
| Jun 11, 1998 | EF3 | 98 km | 18.5 mi | 0 |
| Apr 19, 1996 | EF3 | 93 km | 4.0 mi | 0 |
| Apr 19, 1996 | EF3 | 67 km | 2.0 mi | 1 |
| Nov 22, 1992 | EF3 | 49 km | 12.0 mi | 0 |
| Nov 22, 1992 | EF3 | 96 km | 15.0 mi | 0 |
| Nov 22, 1992 | EF3 | 92 km | 9.0 mi | 0 |
| Mar 10, 1986 | EF3 | 99 km | 35.0 mi | 0 |
| Jun 2, 1980 | EF3 | 8 km | 18.1 mi | 1 |
| Jun 25, 1978 | EF3 | 86 km | 1.0 mi | 0 |
Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 24°F (-4°C) | 2.0 in | Coldest |
| February | 29°F (-2°C) | 2.0 in | Driest |
| March | 40°F (4°C) | 3.2 in | |
| April | 51°F (10°C) | 3.9 in | |
| May | 62°F (16°C) | 4.3 in | Wettest |
| June | 71°F (22°C) | 4.2 in | |
| July | 73°F (23°C) | 4.2 in | Warmest |
| August | 72°F (22°C) | 4.1 in | |
| September | 66°F (19°C) | 3.2 in | |
| October | 54°F (12°C) | 2.8 in | |
| November | 42°F (5°C) | 3.5 in | |
| December | 30°F (-1°C) | 3.0 in |
Hillsboro has a seasonal temperature swing of 49°F / from 24°F in January to 73°F in July. Total annual precipitation is 40.2 inches, with May being the wettest month (4.3") and February the driest (2.0").