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Weather & Climate in Jefferson borough (Greene County), PA
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Jefferson borough (Greene County) experiences four distinct seasons with an average annual temperature of 51°F (11°C). Winters average 29°F in January while summers reach 72°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 43.1 inches. The area receives 30.1 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 976 feet.
Temperature
29°F Jan (-2°C)
72°F Jul (22°C)
| Annual Average | 51.0°F |
| 6% below US avg | |
| January Average | 29°F (-2°C) |
| July Average | 72°F (22°C) |
| Sunny Days | 293 days/yr |
Geography
| Elevation | 976 ft (297 m) |
| Area | 0.1 sq mi (0.2 km²) |
| Population Density | 1,474/sq mi |
| Coordinates | 39.9305°N, 80.0577°W |
| Timezone | America/New_York |
| County | Greene County County |
| Nearest Airport | Pittsburgh International (PIT) 40 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 40.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Relatively Low |
| Risk Score | 55.1 / 100 |
| Social Vulnerability | 49.3 / 100 |
| Community Resilience | 55.7 / 100 |
Hazard Breakdown
| Tornado | Relatively Low |
| Hurricane | Relatively Low |
| Earthquake | Very Low |
| Wildfire | Very Low |
| Flood | Relatively Moderate |
| Hail | Relatively Low |
| Strong Wind | Relatively Low |
| Heat Wave | Very Low |
| Winter Weather | Very Low |
| Lightning | Relatively Low |
| Ice Storm | Relatively Low |
| Drought | Relatively Low |
| Cold Wave | Relatively Low |
| Landslide | Relatively Moderate |
| Avalanche | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Earthquake History
19 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M3.4.
| Jun 3, 2017 | 1 km WNW of Batesville, Ohio | M3.4 | 105 km | 2 km |
| Apr 22, 2025 | 3 km ESE of Buffalo, Ohio | M3.1 | 122 km | 5 km |
| Aug 31, 2011 | 3 km SE of Lowell, Ohio | M3.1 | 130 km | 5 km |
| Apr 24, 2025 | 3 km S of Pleasant City, Ohio | M3.1 | 127 km | 6 km |
| Apr 2, 2017 | 5 km W of Graysville, Ohio | M3.0 | 106 km | 4 km |
| Mar 30, 2024 | 2 km SSW of Maple Ridge, Ohio | M3.0 | 137 km | 6 km |
| May 9, 2025 | 3 km S of Pleasant City, Ohio | M2.9 | 127 km | 5 km |
| Aug 7, 2000 | 2 km S of Limaville, Ohio | M2.9 | 147 km | 5 km |
| Apr 29, 2025 | 1 km SE of Pleasant City, Ohio | M2.8 | 126 km | 2 km |
| Feb 3, 2025 | 0 km NE of Reno, Ohio | M2.8 | 130 km | 10 km |
| Aug 31, 2011 | 2 km NNW of Belmont, West Virginia | M2.8 | 119 km | 5 km |
| Jul 30, 2013 | 12 km SSW of Glenville, West Virginia | M2.8 | 142 km | 13 km |
| Jul 20, 2013 | 6 km SW of Glenville, West Virginia | M2.7 | 135 km | 21 km |
| Sep 4, 2011 | 3 km N of Saint Marys, West Virginia | M2.6 | 113 km | 5 km |
| Aug 16, 2013 | 13 km SW of Glenville, West Virginia | M2.6 | 143 km | 6 km |
| Apr 29, 2010 | 5 km NNW of Gassaway, West Virginia | M2.5 | 149 km | 5 km |
| Sep 11, 2024 | 4 km WNW of Claysville, Pennsylvania | M2.5 | 41 km | 4 km |
| Aug 15, 2010 | 19 km ESE of Burnsville, West Virginia | M2.5 | 128 km | 17 km |
| Aug 21, 2010 | 19 km WNW of Helvetia, West Virginia | M2.5 | 130 km | 11 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Tornado History
222 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF4. Total: 6 fatalities, 407 injuries.
| Date | Rating | Distance | Path | Fatalities |
| Jun 2, 1998 | EF4 | 73 km | 36.5 mi | 0 |
| Jun 3, 1980 | EF4 | 85 km | 11.8 mi | 0 |
| May 31, 1998 | EF3 | 86 km | 13.0 mi | 1 |
| Oct 1, 1986 | EF3 | 94 km | 1.0 mi | 0 |
| Jun 3, 1980 | EF3 | 47 km | 29.8 mi | 0 |
| Jul 11, 1976 | EF3 | 67 km | 11.8 mi | 1 |
| May 19, 1967 | EF3 | 87 km | 0.3 mi | 1 |
| Aug 3, 1963 | EF3 | 46 km | 0.1 mi | 2 |
| Jun 26, 2024 | EF2 | 62 km | 10.8 mi | 0 |
| May 11, 2024 | EF2 | 38 km | 5.8 mi | 0 |
| May 7, 2024 | EF2 | 96 km | 15.3 mi | 0 |
| Feb 28, 2024 | EF2 | 94 km | 4.1 mi | 0 |
| Aug 25, 2023 | EF2 | 51 km | 2.0 mi | 0 |
| Aug 1, 2022 | EF2 | 42 km | 1.8 mi | 0 |
| Oct 21, 2021 | EF2 | 51 km | 15.7 mi | 0 |
| Jul 29, 2021 | EF2 | 86 km | 2.7 mi | 0 |
| Oct 2, 2018 | EF2 | 61 km | 1.6 mi | 0 |
| Mar 23, 2011 | EF2 | 47 km | 9.0 mi | 0 |
| Apr 28, 2002 | EF2 | 100 km | 5.0 mi | 0 |
| May 23, 2000 | EF2 | 99 km | 3.0 mi | 0 |
Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 29°F (-2°C) | 2.6 in | Coldest |
| February | 31°F (-0°C) | 2.4 in | Driest |
| March | 40°F (5°C) | 3.6 in | |
| April | 50°F (10°C) | 3.5 in | |
| May | 60°F (15°C) | 4.1 in | |
| June | 68°F (20°C) | 3.9 in | |
| July | 72°F (22°C) | 4.2 in | Warmest, Wettest |
| August | 71°F (21°C) | 3.8 in | |
| September | 64°F (18°C) | 3.2 in | |
| October | 53°F (11°C) | 2.6 in | |
| November | 43°F (6°C) | 3.2 in | |
| December | 33°F (1°C) | 3.0 in |
Jefferson borough (Greene County) has a seasonal temperature swing of 43°F / from 29°F in January to 72°F in July. Total annual precipitation is 39.8 inches, with July being the wettest month (4.2") and February the driest (2.4").