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Weather & Climate in Liberty borough (Allegheny County), PA
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Liberty borough (Allegheny County) experiences four distinct seasons with an average annual temperature of 52°F (11°C). Winters average 30°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 42.4 inches. Air quality is rated Good with a median AQI of 40. The city sits at an elevation of 1,027 feet.
Temperature
30°F Jan (-1°C)
73°F Jul (23°C)
| Annual Average | 51.7°F |
| 4% below US avg | |
| January Average | 30°F (-1°C) |
| July Average | 73°F (23°C) |
| Sunny Days | 275 days/yr |
Geography
| Elevation | 1,027 ft (313 m) |
| Area | 0.6 sq mi (1.5 km²) |
| Population Density | 1,610/sq mi |
| Coordinates | 40.3217°N, 79.8632°W |
| Timezone | America/New_York |
| County | Allegheny County County |
| Nearest Airport | Pittsburgh International (PIT) 23 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 40.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Relatively High |
| Risk Score | 98.1 / 100 |
| Social Vulnerability | 32.7 / 100 |
| Community Resilience | 91.9 / 100 |
Hazard Breakdown
| Tornado | Relatively High |
| Hurricane | Relatively Low |
| Earthquake | Relatively Low |
| Wildfire | Very Low |
| Flood | Very High |
| Hail | Very Low |
| Strong Wind | Relatively High |
| Heat Wave | Relatively Moderate |
| Winter Weather | Relatively High |
| Lightning | Relatively High |
| Ice Storm | Very High |
| Drought | No Rating |
| Cold Wave | Very High |
| Landslide | Relatively Low |
| Avalanche | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Earthquake History
8 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M4.5.
| Sep 25, 1998 | 2 km SW of Adamsville, Pennsylvania | M4.5 | 138 km | 5 km |
| Jun 3, 2017 | 1 km WNW of Batesville, Ohio | M3.4 | 130 km | 2 km |
| Apr 22, 2025 | 3 km ESE of Buffalo, Ohio | M3.1 | 146 km | 5 km |
| Apr 2, 2017 | 5 km W of Graysville, Ohio | M3.0 | 138 km | 4 km |
| Mar 30, 2024 | 2 km SSW of Maple Ridge, Ohio | M3.0 | 120 km | 6 km |
| Aug 7, 2000 | 2 km S of Limaville, Ohio | M2.9 | 130 km | 5 km |
| Apr 29, 2025 | 1 km SE of Pleasant City, Ohio | M2.8 | 149 km | 2 km |
| Sep 11, 2024 | 4 km WNW of Claysville, Pennsylvania | M2.5 | 55 km | 4 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Tornado History
280 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF4. Total: 15 fatalities, 555 injuries.
| Date | Rating | Distance | Path | Fatalities |
| Jun 2, 1998 | EF4 | 62 km | 36.5 mi | 0 |
| Jun 3, 1980 | EF4 | 38 km | 11.8 mi | 0 |
| May 31, 1998 | EF3 | 92 km | 13.0 mi | 1 |
| May 31, 1985 | EF3 | 76 km | 39.0 mi | 9 |
| Jun 3, 1980 | EF3 | 88 km | 29.8 mi | 0 |
| Jul 11, 1976 | EF3 | 31 km | 11.8 mi | 1 |
| Aug 3, 1963 | EF3 | 1 km | 0.1 mi | 2 |
| Jun 26, 2024 | EF2 | 19 km | 10.8 mi | 0 |
| May 11, 2024 | EF2 | 18 km | 5.8 mi | 0 |
| May 7, 2024 | EF2 | 85 km | 15.3 mi | 0 |
| Aug 25, 2023 | EF2 | 53 km | 2.0 mi | 0 |
| Aug 1, 2022 | EF2 | 66 km | 1.8 mi | 0 |
| Mar 31, 2022 | EF2 | 70 km | 8.6 mi | 0 |
| Oct 21, 2021 | EF2 | 56 km | 15.7 mi | 0 |
| Jul 29, 2021 | EF2 | 98 km | 2.7 mi | 0 |
| Oct 2, 2018 | EF2 | 44 km | 1.6 mi | 0 |
| Mar 23, 2011 | EF2 | 11 km | 9.0 mi | 0 |
| Apr 28, 2002 | EF2 | 60 km | 5.0 mi | 0 |
| Apr 9, 2001 | EF2 | 97 km | 4.0 mi | 0 |
| Jun 2, 1998 | EF2 | 66 km | 12.0 mi | 0 |
Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 30°F (-1°C) | 2.5 in | Coldest |
| February | 31°F (-1°C) | 2.3 in | Driest |
| March | 40°F (4°C) | 3.4 in | |
| April | 50°F (10°C) | 3.3 in | |
| May | 60°F (16°C) | 3.9 in | Wettest |
| June | 68°F (20°C) | 3.8 in | |
| July | 73°F (23°C) | 3.8 in | Warmest |
| August | 71°F (22°C) | 3.7 in | |
| September | 64°F (18°C) | 3.2 in | |
| October | 53°F (12°C) | 2.6 in | |
| November | 43°F (6°C) | 3.0 in | |
| December | 33°F (1°C) | 2.8 in |
Liberty borough (Allegheny County) has a seasonal temperature swing of 44°F / from 30°F in January to 73°F in July. Total annual precipitation is 38.1 inches, with May being the wettest month (3.9") and February the driest (2.3").