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Weather & Climate in Hamilton, OH
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Hamilton experiences four distinct seasons with an average annual temperature of 54°F (12°C). Winters average 31°F in January while summers reach 76°F in July. The area gets 293 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 41.4 inches. Air quality is rated Moderate with a median AQI of 52. 45% of days have good air quality. The city sits at an elevation of 591 feet.
Temperature
31°F Jan (-1°C)
76°F Jul (24°C)
| Annual Average | 53.8°F |
| 0% below US avg | |
| January Average | 31°F (-1°C) |
| July Average | 76°F (24°C) |
| Sunny Days | 293 days/yr |
Geography
| Elevation | 591 ft (180 m) |
| Area | 21.9 sq mi (56.7 km²) |
| Population Density | 2,940/sq mi |
| Coordinates | 39.3934°N, 84.5658°W |
| Timezone | America/New_York |
| County | Butler County County |
| Nearest Airport | Butler County Regional/Hogan Field (HAO) 3 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 52.0 |
| Rating | Moderate |
| Good Days % | 44.8% |
| Unhealthy Days | 11 |
Natural Hazard Risk
| Overall Risk | Relatively Moderate |
| Risk Score | 91.5 / 100 |
| Social Vulnerability | 22.4 / 100 |
| Community Resilience | 74.1 / 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 Moderate |
| Winter Weather | Relatively High |
| Lightning | Relatively High |
| Ice Storm | Relatively High |
| Drought | Relatively Low |
| Cold Wave | Relatively High |
| Landslide | Relatively Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Earthquake History
9 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 | 97 km | 2 km |
| Feb 19, 1995 | 8 km SSE of Rocky Fork Point, Ohio | M3.6 | 99 km | 10 km |
| Apr 17, 1990 | 8 km NW of Fort Recovery, Ohio | M3.0 | 121 km | 5 km |
| Apr 4, 1994 | 2 km WNW of Minster, Ohio | M2.9 | 113 km | 5 km |
| Mar 17, 1999 | 2 km NNE of Ripley, Ohio | M2.8 | 95 km | 0 km |
| May 11, 2015 | 5 km ESE of Maysville, Kentucky | M2.6 | 115 km | 11 km |
| Jul 23, 2013 | 6 km NNE of Germantown, Kentucky | M2.6 | 93 km | 4 km |
| Jan 28, 2024 | 3 km SW of Old Washington, Kentucky | M2.5 | 109 km | 15 km |
| Jan 30, 2004 | 2 km S of Rockford, Ohio | M2.5 | 142 km | 5 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Tornado History
519 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF5. Total: 78 fatalities, 2,955 injuries.
| Date | Rating | Distance | Path | Fatalities |
| Apr 3, 1974 | EF5 | 52 km | 31.3 mi | 36 |
| Apr 3, 1974 | EF5 | 54 km | 20.8 mi | 3 |
| May 27, 2019 | EF4 | 49 km | 18.2 mi | 0 |
| Mar 2, 2012 | EF4 | 67 km | 9.9 mi | 4 |
| Sep 20, 2000 | EF4 | 58 km | 9.0 mi | 1 |
| Apr 9, 1999 | EF4 | 25 km | 10.0 mi | 4 |
| Nov 22, 1992 | EF4 | 98 km | 26.7 mi | 1 |
| Jun 2, 1990 | EF4 | 36 km | 33.0 mi | 0 |
| Jul 9, 1980 | EF4 | 82 km | 11.0 mi | 2 |
| Apr 3, 1974 | EF4 | 25 km | 19.8 mi | 2 |
| Apr 3, 1974 | EF4 | 92 km | 27.1 mi | 0 |
| Apr 3, 1974 | EF4 | 95 km | 18.0 mi | 1 |
| Apr 23, 1968 | EF4 | 41 km | 24.1 mi | 1 |
| Apr 23, 1968 | EF4 | 82 km | 78.7 mi | 6 |
| Mar 14, 2024 | EF3 | 100 km | 41.3 mi | 1 |
| May 27, 2019 | EF3 | 57 km | 9.9 mi | 0 |
| May 27, 2019 | EF3 | 65 km | 10.5 mi | 0 |
| May 14, 2014 | EF3 | 69 km | 8.9 mi | 0 |
| Mar 2, 2012 | EF3 | 65 km | 20.4 mi | 3 |
| Mar 2, 2012 | EF3 | 81 km | 8.7 mi | 3 |
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 | 93 km |
| 2005 | RX BURNPLAN AREA 2-06 | 5,054 | 93 km |
| 2007 | UNITS 8-9 2008 | 4,316 | 95 km |
| 2006 | UNIT 19 06 WUI | 3,412 | 95 km |
| 2003 | WUI 3 03 | 3,372 | 89 km |
| 2010 | WUI UNIT 28K | 3,230 | 86 km |
| 1999 | UNNAMED | 3,122 | 89 km |
| 2002 | UNIT 8 | 2,753 | 96 km |
| 2005 | UNIT 3 05 | 2,511 | 89 km |
| 2001 | 01 UNIT 16 | 2,361 | 92 km |
| 2011 | WUI UNITS 0 AND 1 2011 | 2,215 | 96 km |
| 2004 | UNIT 19 | 2,004 | 96 km |
| 2003 | UNIT 8 03 | 1,971 | 94 km |
| 2008 | FY 09 UNIT 42 RX FALL 2008 | 1,942 | 92 km |
| 2000 | JPG 14 | 1,908 | 94 km |
| 2003 | UNIT 16 03 | 1,809 | 93 km |
| 2002 | UNIT 9 | 1,485 | 94 km |
| 1995 | UNNAMED | 1,462 | 92 km |
| 2010 | TRACER | 1,408 | 87 km |
| 2007 | UNNAMED | 1,334 | 91 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 31°F (-1°C) | 2.6 in | Coldest |
| February | 32°F (-0°C) | 2.5 in | Driest |
| March | 42°F (6°C) | 3.7 in | |
| April | 52°F (11°C) | 3.9 in | |
| May | 62°F (17°C) | 4.5 in | Wettest |
| June | 71°F (22°C) | 3.6 in | |
| July | 76°F (24°C) | 4.0 in | Warmest |
| August | 73°F (23°C) | 3.6 in | |
| September | 67°F (19°C) | 2.9 in | |
| October | 55°F (13°C) | 3.0 in | |
| November | 44°F (6°C) | 3.5 in | |
| December | 33°F (1°C) | 3.2 in |
Hamilton has a seasonal temperature swing of 45°F / from 31°F in January to 76°F in July. Total annual precipitation is 40.9 inches, with May being the wettest month (4.5") and February the driest (2.5").