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Weather & Climate in Fairfield, OH
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Fairfield 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 Good with a median AQI of 43. The city sits at an elevation of 627 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 | 627 ft (191 m) |
| Area | 21.1 sq mi (54.5 km²) |
| Population Density | 2,141/sq mi |
| Coordinates | 39.3314°N, 84.5427°W |
| Timezone | America/New_York |
| County | Butler County County |
| Nearest Airport | Butler County Regional/Hogan Field (HAO) 2 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 43.0 |
| Rating | Good |
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
11 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 | 101 km | 2 km |
| Feb 19, 1995 | 8 km SSE of Rocky Fork Point, Ohio | M3.6 | 95 km | 10 km |
| Sep 8, 1990 | 5 km N of Owingsville, Kentucky | M3.3 | 143 km | 0 km |
| Apr 17, 1990 | 8 km NW of Fort Recovery, Ohio | M3.0 | 128 km | 5 km |
| Apr 4, 1994 | 2 km WNW of Minster, Ohio | M2.9 | 119 km | 5 km |
| Mar 17, 1999 | 2 km NNE of Ripley, Ohio | M2.8 | 88 km | 0 km |
| May 11, 2015 | 5 km ESE of Maysville, Kentucky | M2.6 | 108 km | 11 km |
| Jul 23, 2013 | 6 km NNE of Germantown, Kentucky | M2.6 | 86 km | 4 km |
| Jan 28, 2024 | 3 km SW of Old Washington, Kentucky | M2.5 | 102 km | 15 km |
| Jan 30, 2004 | 2 km S of Rockford, Ohio | M2.5 | 149 km | 5 km |
| Jan 4, 1999 | 9 km WNW of Mount Sterling, Kentucky | M2.5 | 146 km | 10 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Tornado History
513 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF5. Total: 77 fatalities, 2,902 injuries.
| Date | Rating | Distance | Path | Fatalities |
| Apr 3, 1974 | EF5 | 50 km | 20.8 mi | 3 |
| Apr 3, 1974 | EF5 | 54 km | 31.3 mi | 36 |
| May 27, 2019 | EF4 | 55 km | 18.2 mi | 0 |
| Mar 2, 2012 | EF4 | 61 km | 9.9 mi | 4 |
| Sep 20, 2000 | EF4 | 60 km | 9.0 mi | 1 |
| Apr 9, 1999 | EF4 | 19 km | 10.0 mi | 4 |
| Nov 22, 1992 | EF4 | 93 km | 26.7 mi | 1 |
| Jun 2, 1990 | EF4 | 35 km | 33.0 mi | 0 |
| Jul 9, 1980 | EF4 | 87 km | 11.0 mi | 2 |
| Apr 3, 1974 | EF4 | 89 km | 27.1 mi | 0 |
| Apr 3, 1974 | EF4 | 18 km | 19.8 mi | 2 |
| Apr 23, 1968 | EF4 | 35 km | 24.1 mi | 1 |
| Apr 23, 1968 | EF4 | 75 km | 78.7 mi | 6 |
| May 27, 2019 | EF3 | 61 km | 9.9 mi | 0 |
| May 27, 2019 | EF3 | 72 km | 10.5 mi | 0 |
| May 14, 2014 | EF3 | 71 km | 8.9 mi | 0 |
| Mar 2, 2012 | EF3 | 80 km | 8.7 mi | 3 |
| Mar 2, 2012 | EF3 | 58 km | 20.4 mi | 3 |
| Jun 3, 2008 | EF3 | 99 km | 9.7 mi | 1 |
| Apr 9, 1999 | EF3 | 91 km | 15.0 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 | 91 km |
| 2005 | RX BURNPLAN AREA 2-06 | 5,054 | 91 km |
| 2007 | UNITS 8-9 2008 | 4,316 | 93 km |
| 2006 | UNIT 19 06 WUI | 3,412 | 93 km |
| 2003 | WUI 3 03 | 3,372 | 87 km |
| 2010 | WUI UNIT 28K | 3,230 | 85 km |
| 1999 | UNNAMED | 3,122 | 88 km |
| 2002 | UNIT 8 | 2,753 | 93 km |
| 2005 | UNIT 3 05 | 2,511 | 88 km |
| 2001 | 01 UNIT 16 | 2,361 | 89 km |
| 2011 | WUI UNITS 0 AND 1 2011 | 2,215 | 93 km |
| 2004 | UNIT 19 | 2,004 | 94 km |
| 2003 | UNIT 8 03 | 1,971 | 92 km |
| 2008 | FY 09 UNIT 42 RX FALL 2008 | 1,942 | 90 km |
| 2000 | JPG 14 | 1,908 | 92 km |
| 2003 | UNIT 16 03 | 1,809 | 90 km |
| 2002 | UNIT 9 | 1,485 | 92 km |
| 1995 | UNNAMED | 1,462 | 90 km |
| 2010 | TRACER | 1,408 | 85 km |
| 2007 | UNNAMED | 1,334 | 89 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 31°F (-1°C) | 2.7 in | Coldest |
| February | 32°F (0°C) | 2.6 in | Driest |
| March | 43°F (6°C) | 3.9 in | |
| April | 52°F (11°C) | 4.0 in | |
| May | 63°F (17°C) | 4.6 in | Wettest |
| June | 71°F (22°C) | 3.8 in | |
| July | 76°F (24°C) | 4.0 in | Warmest |
| August | 74°F (23°C) | 3.7 in | |
| September | 67°F (19°C) | 3.0 in | |
| October | 55°F (13°C) | 3.0 in | |
| November | 44°F (7°C) | 3.5 in | |
| December | 34°F (1°C) | 3.2 in |
Fairfield has a seasonal temperature swing of 45°F / from 31°F in January to 76°F in July. Total annual precipitation is 42.0 inches, with May being the wettest month (4.6") and February the driest (2.6").