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Weather & Climate in Marengo, IN
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Marengo enjoys a temperate climate with an average annual temperature of 56°F (14°C). Winters average 33°F in January while summers reach 77°F in July. The area gets 290 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 51.0 inches (wetter than the 38-inch national average). Air quality is rated Good with a median AQI of 41. The city sits at an elevation of 625 feet.
Temperature
33°F Jan (1°C)
77°F Jul (25°C)
| Annual Average | 56.3°F |
| 4% above US avg | |
| January Average | 33°F (1°C) |
| July Average | 77°F (25°C) |
| Sunny Days | 290 days/yr |
Geography
| Elevation | 625 ft (191 m) |
| Area | 1.1 sq mi (2.8 km²) |
| Population Density | 769/sq mi |
| Coordinates | 38.3712°N, 86.3428°W |
| Timezone | America/Indiana/Indianapolis |
| County | Crawford County County |
| Nearest Airport | Louisville Muhammad Ali International (SDF) 36 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 41.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Very Low |
| Risk Score | 25.8 / 100 |
| Social Vulnerability | 83.8 / 100 |
| Community Resilience | 19.2 / 100 |
Hazard Breakdown
| Tornado | Relatively Low |
| Hurricane | Very Low |
| Earthquake | Very Low |
| Wildfire | Very Low |
| Flood | Relatively Low |
| Hail | Very Low |
| Strong Wind | Relatively Low |
| Heat Wave | Relatively Low |
| Winter Weather | Relatively Low |
| Lightning | Very Low |
| Ice Storm | Relatively Low |
| Drought | Very Low |
| Cold Wave | Relatively Low |
| Landslide | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Earthquake History
51 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M5.2.
| Apr 18, 2008 | 7 km NNE of Bellmont, Illinois | M5.2 | 135 km | 14 km |
| Apr 18, 2008 | 9 km NNE of Bellmont, Illinois | M4.7 | 133 km | 15 km |
| Jun 18, 2002 | 6 km SW of Parkers Settlement, Indiana | M4.6 | 130 km | 16 km |
| Apr 21, 2008 | 7 km NNE of Bellmont, Illinois | M4.0 | 134 km | 18 km |
| Dec 7, 2000 | 7 km W of Evansville, Indiana | M3.9 | 122 km | 5 km |
| Jan 24, 1990 | 6 km WNW of Alton, Indiana | M3.9 | 29 km | 10 km |
| Jan 27, 1990 | 6 km N of Alton, Indiana | M3.8 | 22 km | 5 km |
| Nov 11, 1991 | 3 km W of Flat Rock, Illinois | M3.8 | 133 km | 0 km |
| Sep 19, 2017 | 4 km N of Bellmont, Illinois | M3.8 | 137 km | 12 km |
| Sep 12, 2004 | 4 km NW of Manilla, Indiana | M3.8 | 149 km | 2 km |
| Apr 25, 2008 | 8 km NNE of Bellmont, Illinois | M3.7 | 134 km | 13 km |
| Dec 20, 1990 | 5 km S of Stilesville, Indiana | M3.7 | 138 km | 5 km |
| Nov 20, 2012 | 7 km N of Bellmont, Illinois | M3.6 | 136 km | 19 km |
| Jun 5, 2008 | 8 km WNW of Mount Carmel, Illinois | M3.4 | 131 km | 16 km |
| May 1, 2008 | 8 km NNE of Bellmont, Illinois | M3.3 | 132 km | 14 km |
| Jul 18, 2008 | 6 km NNE of Bellmont, Illinois | M3.1 | 135 km | 18 km |
| May 10, 2012 | 0 km NW of Emison, Indiana | M3.1 | 109 km | 11 km |
| Sep 9, 2017 | 4 km N of Bellmont, Illinois | M3.1 | 137 km | 12 km |
| May 30, 2023 | 6 km W of Calhoun, Kentucky | M3.0 | 127 km | 0 km |
| Nov 28, 1998 | 6 km SW of Bremen, Kentucky | M2.9 | 143 km | 0 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Tornado History
506 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF5. Total: 84 fatalities, 1,498 injuries.
| Date | Rating | Distance | Path | Fatalities |
| Apr 3, 1974 | EF5 | 73 km | 32.0 mi | 31 |
| Apr 3, 1974 | EF5 | 49 km | 68.0 mi | 6 |
| Mar 2, 2012 | EF4 | 15 km | 45.1 mi | 11 |
| May 28, 1996 | EF4 | 57 km | 30.0 mi | 0 |
| Jun 2, 1990 | EF4 | 48 km | 11.0 mi | 1 |
| Jun 2, 1990 | EF4 | 54 km | 18.0 mi | 0 |
| Jun 2, 1990 | EF4 | 100 km | 13.0 mi | 6 |
| Apr 3, 1974 | EF4 | 82 km | 37.9 mi | 3 |
| Apr 3, 1974 | EF4 | 55 km | 18.5 mi | 3 |
| Apr 3, 1974 | EF4 | 55 km | 35.6 mi | 11 |
| May 25, 2011 | EF3 | 54 km | 6.8 mi | 0 |
| Mar 8, 2009 | EF3 | 58 km | 1.1 mi | 0 |
| Oct 18, 2007 | EF3 | 99 km | 7.0 mi | 0 |
| Oct 18, 2007 | EF3 | 70 km | 4.8 mi | 0 |
| Nov 15, 2005 | EF3 | 77 km | 12.0 mi | 0 |
| May 30, 2004 | EF3 | 20 km | 15.0 mi | 1 |
| Sep 20, 2002 | EF3 | 99 km | 112.0 mi | 0 |
| May 23, 2000 | EF3 | 94 km | 6.0 mi | 0 |
| Apr 9, 1999 | EF3 | 98 km | 15.0 mi | 0 |
| Apr 9, 1999 | EF3 | 93 km | 3.0 mi | 0 |
Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).
Wildfire History
20 wildfires (100+ acres) recorded within 100 km. Largest: JPG 09 1 (6,113 acres, 1998).
| Year | Name | Acres Burned | Distance |
| 1998 | JPG 09 1 | 6,113 | 98 km |
| 2005 | RX BURNPLAN AREA 2-06 | 5,054 | 98 km |
| 2007 | UNITS 8-9 2008 | 4,316 | 96 km |
| 2006 | UNIT 19 06 WUI | 3,412 | 96 km |
| 2002 | UNIT 8 | 2,753 | 96 km |
| 2001 | 01 UNIT 16 | 2,361 | 100 km |
| 2011 | WUI UNITS 0 AND 1 2011 | 2,215 | 96 km |
| 2004 | UNIT 19 | 2,004 | 95 km |
| 2003 | UNIT 8 03 | 1,971 | 97 km |
| 2008 | FY 09 UNIT 42 RX FALL 2008 | 1,942 | 99 km |
| 2000 | JPG 14 | 1,908 | 97 km |
| 2003 | UNIT 16 03 | 1,809 | 99 km |
| 2021 | UNNAMED | 1,547 | 84 km |
| 2002 | UNIT 9 | 1,485 | 97 km |
| 1995 | UNNAMED | 1,462 | 99 km |
| 2017 | UNNAMED | 1,336 | 41 km |
| 2004 | UNIT 14 | 1,170 | 97 km |
| 2019 | UNNAMED | 1,057 | 39 km |
| 2021 | UNNAMED | 959 | 38 km |
| 2014 | UNNAMED | 910 | 28 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 33°F (1°C) | 3.2 in | Coldest |
| February | 34°F (1°C) | 3.1 in | |
| March | 44°F (7°C) | 4.5 in | |
| April | 54°F (12°C) | 4.5 in | |
| May | 63°F (17°C) | 4.8 in | Wettest |
| June | 71°F (22°C) | 4.0 in | |
| July | 77°F (25°C) | 4.6 in | Warmest |
| August | 74°F (23°C) | 3.9 in | |
| September | 67°F (20°C) | 3.2 in | |
| October | 56°F (13°C) | 3.0 in | Driest |
| November | 45°F (7°C) | 4.0 in | |
| December | 35°F (2°C) | 3.7 in |
Marengo has a seasonal temperature swing of 44°F / from 33°F in January to 77°F in July. Total annual precipitation is 46.5 inches, with May being the wettest month (4.8") and October the driest (3.0").