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Weather & Climate in St. Clairsville, PA
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
St. Clairsville experiences four distinct seasons with an average annual temperature of 51°F (10°C). Winters average 28°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 40.5 inches. The area receives 37.6 inches of snow annually, a moderate snowfall amount. Air quality is rated Good with a median AQI of 40. The city sits at an elevation of 1,244 feet.
Temperature
28°F Jan (-2°C)
73°F Jul (23°C)
| Annual Average | 50.5°F |
| 6% below US avg | |
| January Average | 28°F (-2°C) |
| July Average | 73°F (23°C) |
| Sunny Days | 275 days/yr |
Geography
| Elevation | 1,244 ft (379 m) |
| Area | 0.0 sq mi (0.0 km²) |
| Population Density | 3,033/sq mi |
| Coordinates | 40.1559°N, 78.5108°W |
| Timezone | America/New_York |
| County | Blair County County |
| Nearest Airport | Greater Cumberland Regional (CBE) 40 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 40.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Relatively Low |
| Risk Score | 77.7 / 100 |
| Social Vulnerability | 57.6 / 100 |
| Community Resilience | 94.1 / 100 |
Hazard Breakdown
| Tornado | Relatively Low |
| Hurricane | Relatively Low |
| Earthquake | Relatively Low |
| Wildfire | Very Low |
| Flood | Relatively Moderate |
| Hail | Relatively Low |
| Strong Wind | Relatively Moderate |
| Heat Wave | Relatively Low |
| Winter Weather | Relatively High |
| Lightning | Relatively Moderate |
| Ice Storm | Very Low |
| Drought | No Rating |
| Cold Wave | Relatively Low |
| Landslide | Relatively Low |
| Avalanche | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Earthquake History
7 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M3.6.
| Jul 16, 2010 | 5 km NNW of Barnesville, Maryland | M3.6 | 137 km | 7 km |
| Jun 13, 2019 | 9 km N of Blain, Pennsylvania | M3.4 | 90 km | 27 km |
| Jun 3, 2010 | 4 km ENE of Franklintown, Pennsylvania | M3.1 | 131 km | 2 km |
| Jan 17, 2016 | 3 km NE of Ranson, West Virginia | M3.0 | 110 km | 5 km |
| Apr 24, 2009 | 1 km S of Franklintown, Pennsylvania | M2.9 | 127 km | 1 km |
| Sep 15, 2019 | 5 km ESE of East Berlin, Pennsylvania | M2.8 | 138 km | 5 km |
| Oct 25, 2009 | 4 km ENE of Franklintown, Pennsylvania | M2.8 | 131 km | 1 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Tornado History
208 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF4. Total: 2 fatalities, 103 injuries.
| Date | Rating | Distance | Path | Fatalities |
| Jun 2, 1998 | EF4 | 62 km | 36.5 mi | 0 |
| May 31, 1998 | EF3 | 66 km | 13.0 mi | 1 |
| Jul 11, 1976 | EF3 | 87 km | 11.8 mi | 1 |
| Apr 16, 1961 | EF3 | 85 km | 0.1 mi | 0 |
| Aug 25, 2023 | EF2 | 84 km | 2.0 mi | 0 |
| Apr 19, 2019 | EF2 | 63 km | 2.9 mi | 0 |
| Apr 19, 2019 | EF2 | 87 km | 4.9 mi | 0 |
| Oct 2, 2018 | EF2 | 76 km | 1.6 mi | 0 |
| Sep 17, 2004 | EF2 | 97 km | 2.0 mi | 0 |
| Apr 28, 2002 | EF2 | 76 km | 5.0 mi | 0 |
| Jun 2, 1998 | EF2 | 98 km | 15.0 mi | 0 |
| Jun 2, 1998 | EF2 | 70 km | 15.0 mi | 0 |
| Aug 15, 1997 | EF2 | 71 km | 3.5 mi | 0 |
| Jul 19, 1996 | EF2 | 94 km | 27.4 mi | 0 |
| Jul 19, 1996 | EF2 | 48 km | 6.0 mi | 0 |
| Sep 26, 1994 | EF2 | 61 km | 3.5 mi | 0 |
| Apr 30, 1994 | EF2 | 83 km | 6.0 mi | 0 |
| Sep 18, 1991 | EF2 | 82 km | 4.0 mi | 0 |
| Nov 20, 1989 | EF2 | 78 km | 3.5 mi | 0 |
| Jun 20, 1989 | EF2 | 89 km | 2.0 mi | 0 |
Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).
Wildfire History
2 wildfires (100+ acres) recorded within 100 km. Largest: BEAR DEN (945 acres, 2014).
| Year | Name | Acres Burned | Distance |
| 2014 | BEAR DEN | 945 | 37 km |
| 2005 | UNNAMED | 510 | 42 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 28°F (-2°C) | 2.5 in | Coldest, Driest |
| February | 29°F (-2°C) | 2.5 in | |
| March | 38°F (3°C) | 3.3 in | |
| April | 49°F (9°C) | 3.3 in | |
| May | 59°F (15°C) | 3.8 in | |
| June | 67°F (19°C) | 3.7 in | |
| July | 73°F (23°C) | 4.0 in | Warmest, Wettest |
| August | 70°F (21°C) | 3.2 in | |
| September | 63°F (17°C) | 3.3 in | |
| October | 52°F (11°C) | 3.0 in | |
| November | 42°F (5°C) | 3.1 in | |
| December | 32°F (-0°C) | 2.8 in |
St. Clairsville has a seasonal temperature swing of 45°F / from 28°F in January to 73°F in July. Total annual precipitation is 38.4 inches, with July being the wettest month (4.0") and January the driest (2.5").