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Weather & Climate in St. Marys, WV
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
St. Marys experiences four distinct seasons with an average annual temperature of 53°F (12°C). Winters average 31°F in January while summers reach 74°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 45.4 inches. The area receives 23.8 inches of snow annually, a moderate snowfall amount. Air quality is rated Good with a median AQI of 39. The city sits at an elevation of 655 feet.
Temperature
31°F Jan (-1°C)
74°F Jul (23°C)
| Annual Average | 53.1°F |
| 2% below US avg | |
| January Average | 31°F (-1°C) |
| July Average | 74°F (23°C) |
| Sunny Days | 293 days/yr |
Geography
| Elevation | 655 ft (200 m) |
| Area | 1.0 sq mi (2.7 km²) |
| Population Density | 2,135/sq mi |
| Coordinates | 39.3944°N, 81.2037°W |
| Timezone | America/New_York |
| County | Pleasants County County |
| Nearest Airport | Mid-Ohio Valley Regional (PKB) 13 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 39.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Very Low |
| Risk Score | 20.3 / 100 |
| Social Vulnerability | 76.3 / 100 |
| Community Resilience | 67.3 / 100 |
Hazard Breakdown
| Tornado | Very Low |
| Hurricane | Very Low |
| Earthquake | Very Low |
| Wildfire | Very Low |
| Flood | Relatively Low |
| Hail | Very Low |
| Strong Wind | Very Low |
| Heat Wave | Very Low |
| Winter Weather | Very Low |
| Lightning | Relatively Low |
| Ice Storm | Relatively Low |
| Drought | Very Low |
| Cold Wave | Very Low |
| Landslide | Relatively Low |
| Avalanche | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Earthquake History
41 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 | 86 km | 8 km |
| May 24, 2017 | 1 km S of McArthur, Ohio | M3.4 | 111 km | 10 km |
| Apr 4, 2010 | 14 km SW of Gassaway, West Virginia | M3.4 | 92 km | 0 km |
| Apr 24, 2009 | 7 km ENE of Rio Grande, Ohio | M3.4 | 109 km | 8 km |
| Jun 3, 2017 | 1 km WNW of Batesville, Ohio | M3.4 | 59 km | 2 km |
| Mar 31, 2013 | West Virginia | M3.4 | 89 km | 8 km |
| Feb 3, 2025 | 2 km NNW of Oak Hill, Ohio | M3.1 | 130 km | 26 km |
| Aug 31, 2011 | 3 km SE of Lowell, Ohio | M3.1 | 26 km | 5 km |
| Apr 22, 2025 | 3 km ESE of Buffalo, Ohio | M3.1 | 61 km | 5 km |
| Apr 24, 2025 | 3 km S of Pleasant City, Ohio | M3.1 | 61 km | 6 km |
| Apr 2, 2017 | 5 km W of Graysville, Ohio | M3.0 | 30 km | 4 km |
| Jun 28, 1991 | 4 km ENE of Pratt, West Virginia | M3.0 | 130 km | 7 km |
| May 9, 2025 | 3 km S of Pleasant City, Ohio | M2.9 | 60 km | 5 km |
| Feb 3, 2025 | 0 km NE of Reno, Ohio | M2.8 | 16 km | 10 km |
| Apr 29, 2025 | 1 km SE of Pleasant City, Ohio | M2.8 | 62 km | 2 km |
| Jan 10, 2012 | 14 km WNW of Birch River, West Virginia | M2.8 | 96 km | 0 km |
| May 6, 2002 | 3 km SE of Racine, Ohio | M2.8 | 77 km | 5 km |
| Aug 31, 2011 | 2 km NNW of Belmont, West Virginia | M2.8 | 6 km | 5 km |
| Jul 30, 2013 | 12 km SSW of Glenville, West Virginia | M2.8 | 67 km | 13 km |
| Jul 20, 2013 | 6 km SW of Glenville, West Virginia | M2.7 | 62 km | 21 km |
Source: USGS Earthquake Catalog (M2.5+, 1990-2025). Sorted by magnitude.
Tornado History
114 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF3. Total: 3 fatalities, 71 injuries.
| Date | Rating | Distance | Path | Fatalities |
| Sep 16, 2010 | EF3 | 57 km | 9.1 mi | 1 |
| Oct 1, 1986 | EF3 | 38 km | 1.0 mi | 0 |
| Feb 28, 2024 | EF2 | 47 km | 4.1 mi | 0 |
| Aug 1, 2022 | EF2 | 91 km | 1.8 mi | 0 |
| Jul 29, 2021 | EF2 | 90 km | 2.7 mi | 0 |
| Sep 16, 2010 | EF2 | 90 km | 3.3 mi | 0 |
| Jul 10, 2003 | EF2 | 42 km | 2.5 mi | 0 |
| Jun 27, 1998 | EF2 | 48 km | 0.3 mi | 1 |
| Jan 8, 1998 | EF2 | 27 km | 2.0 mi | 0 |
| Mar 10, 1986 | EF2 | 84 km | 5.0 mi | 1 |
| Jul 28, 1981 | EF2 | 9 km | 6.2 mi | 0 |
| Jun 21, 1981 | EF2 | 75 km | 1.0 mi | 0 |
| Jun 13, 1981 | EF2 | 95 km | 2.3 mi | 0 |
| Jun 7, 1978 | EF2 | 84 km | 0.8 mi | 0 |
| Aug 14, 1973 | EF2 | 96 km | 12.5 mi | 0 |
| Jul 24, 1971 | EF2 | 42 km | 1.0 mi | 0 |
| Jul 13, 1971 | EF2 | 83 km | 2.0 mi | 0 |
| Aug 22, 1970 | EF2 | 87 km | 1.0 mi | 0 |
| Jun 25, 1968 | EF2 | 79 km | 8.5 mi | 0 |
| Jun 25, 1968 | EF2 | 91 km | 0.1 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 | 81 km |
| 2021 | LONG RIDGE RX UNIT 1-12 | 1,037 | 85 km |
| 2022 | LONG RIDGE RX UNIT 11-19 | 936 | 85 km |
| 2022 | LONG RIDGE RX UNIT 24 | 709 | 81 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 31°F (-1°C) | 2.8 in | Coldest |
| February | 33°F (0°C) | 2.7 in | Driest |
| March | 42°F (6°C) | 3.6 in | |
| April | 52°F (11°C) | 3.4 in | |
| May | 61°F (16°C) | 3.9 in | |
| June | 69°F (21°C) | 3.8 in | |
| July | 74°F (23°C) | 4.3 in | Warmest, Wettest |
| August | 72°F (22°C) | 4.0 in | |
| September | 65°F (19°C) | 3.2 in | |
| October | 54°F (12°C) | 2.9 in | |
| November | 44°F (7°C) | 3.3 in | |
| December | 34°F (1°C) | 3.1 in |
St. Marys has a seasonal temperature swing of 44°F / from 31°F in January to 74°F in July. Total annual precipitation is 41.0 inches, with July being the wettest month (4.3") and February the driest (2.7").