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Weather & Climate in Marietta, OH
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Marietta experiences four distinct seasons with an average annual temperature of 54°F (12°C). Winters average 31°F in January while summers reach 75°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 45.3 inches. The area receives 16.3 inches of snow annually, a moderate snowfall amount. Air quality is rated Good with a median AQI of 43. The city sits at an elevation of 706 feet.
Temperature
31°F Jan (-0°C)
75°F Jul (24°C)
| Annual Average | 53.8°F |
| 0% below US avg | |
| January Average | 31°F (-0°C) |
| July Average | 75°F (24°C) |
| Sunny Days | 293 days/yr |
Geography
| Elevation | 706 ft (215 m) |
| Area | 8.8 sq mi (22.7 km²) |
| Population Density | 1,576/sq mi |
| Coordinates | 39.4232°N, 81.4464°W |
| Timezone | America/New_York |
| County | Washington County County |
| Nearest Airport | Mid-Ohio Valley Regional (PKB) 5 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 43.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Relatively Low |
| Risk Score | 64.4 / 100 |
| Social Vulnerability | 49.2 / 100 |
| Community Resilience | 52.1 / 100 |
Hazard Breakdown
| Tornado | Relatively Low |
| Hurricane | Very Low |
| Earthquake | Very Low |
| Wildfire | Very Low |
| Flood | Relatively Moderate |
| Hail | Relatively Low |
| Strong Wind | Relatively Low |
| Heat Wave | Relatively Low |
| Winter Weather | Very Low |
| Lightning | Relatively Moderate |
| Ice Storm | Relatively Moderate |
| Drought | Relatively Low |
| Cold Wave | Very Low |
| Landslide | Relatively Moderate |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Earthquake History
39 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M3.5.
| Nov 20, 2013 | 2 km SW of Buchtel, Ohio | M3.5 | 65 km | 8 km |
| May 24, 2017 | 1 km S of McArthur, Ohio | M3.4 | 91 km | 10 km |
| Apr 4, 2010 | 14 km SW of Gassaway, West Virginia | M3.4 | 103 km | 0 km |
| Apr 24, 2009 | 7 km ENE of Rio Grande, Ohio | M3.4 | 94 km | 8 km |
| Mar 31, 2013 | West Virginia | M3.4 | 102 km | 8 km |
| Jun 3, 2017 | 1 km WNW of Batesville, Ohio | M3.4 | 56 km | 2 km |
| Feb 3, 2025 | 2 km NNW of Oak Hill, Ohio | M3.1 | 113 km | 26 km |
| Aug 31, 2011 | 3 km SE of Lowell, Ohio | M3.1 | 10 km | 5 km |
| Apr 22, 2025 | 3 km ESE of Buffalo, Ohio | M3.1 | 53 km | 5 km |
| Apr 24, 2025 | 3 km S of Pleasant City, Ohio | M3.1 | 51 km | 6 km |
| Jun 28, 1991 | 4 km ENE of Pratt, West Virginia | M3.0 | 133 km | 7 km |
| Apr 2, 2017 | 5 km W of Graysville, Ohio | M3.0 | 32 km | 4 km |
| May 9, 2025 | 3 km S of Pleasant City, Ohio | M2.9 | 50 km | 5 km |
| Jan 10, 2012 | 14 km WNW of Birch River, West Virginia | M2.8 | 107 km | 0 km |
| May 6, 2002 | 3 km SE of Racine, Ohio | M2.8 | 65 km | 5 km |
| Apr 29, 2025 | 1 km SE of Pleasant City, Ohio | M2.8 | 53 km | 2 km |
| Aug 31, 2011 | 2 km NNW of Belmont, West Virginia | M2.8 | 15 km | 5 km |
| Jul 30, 2013 | 12 km SSW of Glenville, West Virginia | M2.8 | 80 km | 13 km |
| Feb 3, 2025 | 0 km NE of Reno, Ohio | M2.8 | 7 km | 10 km |
| Jul 20, 2013 | 6 km SW of Glenville, West Virginia | M2.7 | 76 km | 21 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Tornado History
127 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF3. Total: 4 fatalities, 102 injuries.
| Date | Rating | Distance | Path | Fatalities |
| Sep 16, 2010 | EF3 | 42 km | 9.1 mi | 1 |
| Oct 1, 1986 | EF3 | 59 km | 1.0 mi | 0 |
| May 8, 1969 | EF3 | 100 km | 2.0 mi | 1 |
| Jun 5, 2024 | EF2 | 97 km | 1.3 mi | 0 |
| Feb 28, 2024 | EF2 | 51 km | 4.1 mi | 0 |
| Jul 29, 2021 | EF2 | 93 km | 2.7 mi | 0 |
| Sep 16, 2010 | EF2 | 90 km | 7.0 mi | 0 |
| Sep 16, 2010 | EF2 | 69 km | 3.3 mi | 0 |
| Jul 10, 2003 | EF2 | 26 km | 2.5 mi | 0 |
| May 8, 2002 | EF2 | 99 km | 3.0 mi | 0 |
| Jun 27, 1998 | EF2 | 42 km | 0.3 mi | 1 |
| Jan 8, 1998 | EF2 | 23 km | 2.0 mi | 0 |
| Mar 10, 1986 | EF2 | 69 km | 5.0 mi | 1 |
| Jul 28, 1981 | EF2 | 13 km | 6.2 mi | 0 |
| Jun 21, 1981 | EF2 | 95 km | 1.0 mi | 0 |
| Jun 13, 1981 | EF2 | 81 km | 2.3 mi | 0 |
| Jun 13, 1981 | EF2 | 90 km | 2.0 mi | 0 |
| Jun 7, 1978 | EF2 | 74 km | 0.8 mi | 0 |
| Aug 14, 1973 | EF2 | 80 km | 12.5 mi | 0 |
| Jul 24, 1971 | EF2 | 23 km | 1.0 mi | 0 |
Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).
Wildfire History
4 wildfires (100+ acres) recorded within 100 km. Largest: LONG RIDGE RX UNIT 37-38 (1,050 acres, 2022).
| Year | Name | Acres Burned | Distance |
| 2022 | LONG RIDGE RX UNIT 37-38 | 1,050 | 60 km |
| 2021 | LONG RIDGE RX UNIT 1-12 | 1,037 | 64 km |
| 2022 | LONG RIDGE RX UNIT 11-19 | 936 | 64 km |
| 2022 | LONG RIDGE RX UNIT 24 | 709 | 60 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 31°F (-0°C) | 2.6 in | Coldest |
| February | 33°F (0°C) | 2.6 in | Driest |
| March | 42°F (6°C) | 3.6 in | |
| April | 52°F (11°C) | 3.4 in | |
| May | 62°F (16°C) | 3.9 in | |
| June | 70°F (21°C) | 3.7 in | |
| July | 75°F (24°C) | 4.3 in | Warmest, Wettest |
| August | 72°F (22°C) | 3.9 in | |
| September | 66°F (19°C) | 3.1 in | |
| October | 54°F (12°C) | 2.8 in | |
| November | 44°F (7°C) | 3.2 in | |
| December | 35°F (2°C) | 3.0 in |
Marietta has a seasonal temperature swing of 44°F / from 31°F in January to 75°F in July. Total annual precipitation is 40.2 inches, with July being the wettest month (4.3") and February the driest (2.6").