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Weather & Climate in Decatur, IN
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Decatur experiences four distinct seasons with an average annual temperature of 51°F (10°C). Winters average 26°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 40.6 inches. The area receives 28.1 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 801 feet.
Temperature
26°F Jan (-4°C)
73°F Jul (23°C)
| Annual Average | 50.7°F |
| 6% below US avg | |
| January Average | 26°F (-4°C) |
| July Average | 73°F (23°C) |
| Sunny Days | 275 days/yr |
Geography
| Elevation | 801 ft (244 m) |
| Area | 5.8 sq mi (15.0 km²) |
| Population Density | 1,601/sq mi |
| Coordinates | 40.8289°N, 84.9278°W |
| Timezone | America/Indiana/Indianapolis |
| County | Adams County County |
| Nearest Airport | Fort Wayne International (FWA) 17 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 41.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Relatively Low |
| Risk Score | 52.1 / 100 |
| Social Vulnerability | 85.2 / 100 |
| Community Resilience | 45.0 / 100 |
Hazard Breakdown
| Tornado | Relatively Moderate |
| Hurricane | Very Low |
| Earthquake | Relatively Low |
| Wildfire | Very Low |
| Flood | Relatively Low |
| Hail | Relatively Low |
| Strong Wind | Relatively High |
| Heat Wave | Relatively Low |
| Winter Weather | Relatively Low |
| Lightning | Relatively Low |
| Ice Storm | Relatively Low |
| Drought | No Rating |
| Cold Wave | Relatively Low |
| Landslide | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Earthquake History
12 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M3.8.
| Sep 12, 2004 | 4 km NW of Manilla, Indiana | M3.8 | 150 km | 2 km |
| Jun 30, 2015 | 5 km NNE of Burlington, Michigan | M3.3 | 147 km | 5 km |
| Jan 26, 2012 | 5 km NE of Topeka, Indiana | M3.0 | 96 km | 5 km |
| Apr 17, 1990 | 8 km NW of Fort Recovery, Ohio | M3.0 | 42 km | 5 km |
| Apr 4, 1994 | 2 km WNW of Minster, Ohio | M2.9 | 65 km | 5 km |
| May 12, 2006 | 2 km E of Lima, Ohio | M2.8 | 72 km | 5 km |
| May 14, 2010 | 1 km ENE of Gibsonburg, Ohio | M2.7 | 150 km | 5 km |
| Jun 12, 2015 | 6 km NW of Convoy, Ohio | M2.6 | 20 km | 5 km |
| May 20, 2023 | 3 km SSE of Walbridge, Ohio | M2.6 | 145 km | 6 km |
| Jan 30, 2004 | 2 km S of Rockford, Ohio | M2.5 | 29 km | 5 km |
| Jun 4, 1990 | 4 km SSE of Van Buren, Ohio | M2.5 | 112 km | 5 km |
| Mar 18, 2024 | 4 km WSW of Millbury, Ohio | M2.5 | 146 km | 6 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Tornado History
480 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF4. Total: 57 fatalities, 1,114 injuries.
| Date | Rating | Distance | Path | Fatalities |
| Nov 10, 2002 | EF4 | 14 km | 52.8 mi | 4 |
| Feb 18, 1992 | EF4 | 32 km | 2.8 mi | 0 |
| Apr 3, 1974 | EF4 | 91 km | 18.0 mi | 1 |
| Apr 11, 1965 | EF4 | 61 km | 32.5 mi | 13 |
| Apr 11, 1965 | EF4 | 71 km | 18.4 mi | 3 |
| Apr 11, 1965 | EF4 | 49 km | 52.5 mi | 4 |
| Mar 6, 1956 | EF4 | 61 km | 1.9 mi | 1 |
| Jun 8, 1953 | EF4 | 97 km | 118.0 mi | 17 |
| Mar 14, 2024 | EF3 | 73 km | 31.3 mi | 3 |
| Mar 14, 2024 | EF3 | 74 km | 41.3 mi | 1 |
| Mar 31, 2023 | EF3 | 68 km | 6.4 mi | 0 |
| May 27, 2019 | EF3 | 48 km | 12.8 mi | 0 |
| May 27, 2019 | EF3 | 37 km | 10.8 mi | 1 |
| Aug 24, 2016 | EF3 | 35 km | 5.2 mi | 0 |
| Nov 10, 2002 | EF3 | 18 km | 5.0 mi | 0 |
| Oct 24, 2001 | EF3 | 51 km | 32.0 mi | 0 |
| Mar 27, 1991 | EF3 | 79 km | 21.0 mi | 1 |
| Mar 10, 1986 | EF3 | 89 km | 7.6 mi | 0 |
| Apr 3, 1974 | EF3 | 80 km | 36.2 mi | 5 |
| Apr 3, 1974 | EF3 | 47 km | 8.7 mi | 0 |
Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 26°F (-4°C) | 2.0 in | Coldest |
| February | 27°F (-3°C) | 1.9 in | Driest |
| March | 38°F (3°C) | 2.8 in | |
| April | 49°F (9°C) | 3.5 in | |
| May | 60°F (16°C) | 3.7 in | |
| June | 70°F (21°C) | 4.0 in | Wettest |
| July | 73°F (23°C) | 3.8 in | Warmest |
| August | 71°F (22°C) | 3.4 in | |
| September | 64°F (18°C) | 3.0 in | |
| October | 53°F (11°C) | 2.5 in | |
| November | 41°F (5°C) | 3.0 in | |
| December | 30°F (-1°C) | 2.7 in |
Decatur has a seasonal temperature swing of 48°F / from 26°F in January to 73°F in July. Total annual precipitation is 36.2 inches, with June being the wettest month (4.0") and February the driest (1.9").