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Weather & Climate in Portville, NY
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Portville experiences four distinct seasons with an average annual temperature of 46°F (8°C). Winters average 22°F in January while summers reach 69°F in July. The area gets 246 sunny days per year, above the national average. Annual precipitation totals 40.7 inches. The area receives 64.7 inches of snow annually, making winter weather a significant factor for residents. Air quality is rated Good with a median AQI of 36. The city sits at an elevation of 1,429 feet.
Temperature
22°F Jan (-5°C)
69°F Jul (20°C)
| Annual Average | 46.3°F |
| 14% below US avg | |
| January Average | 22°F (-5°C) |
| July Average | 69°F (20°C) |
| Sunny Days | 246 days/yr |
Geography
| Elevation | 1,429 ft (436 m) |
| Area | 0.8 sq mi (2.1 km²) |
| Population Density | 1,144/sq mi |
| Coordinates | 42.0367°N, 78.3373°W |
| Timezone | America/New_York |
| County | Allegany County County |
| Nearest Airport | Bradford Regional (BFD) 22 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 36.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Relatively Low |
| Risk Score | 69.8 / 100 |
| Social Vulnerability | 47.7 / 100 |
| Community Resilience | 72.2 / 100 |
Hazard Breakdown
| Tornado | Relatively Low |
| Hurricane | Relatively Low |
| Earthquake | Very Low |
| Wildfire | Very Low |
| Flood | Relatively Moderate |
| Hail | Very Low |
| Strong Wind | Relatively Moderate |
| Heat Wave | Very Low |
| Winter Weather | Relatively Low |
| Lightning | Relatively Moderate |
| Ice Storm | Relatively Low |
| Drought | Very Low |
| Cold Wave | Relatively Low |
| Landslide | Relatively Low |
| Avalanche | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Earthquake History
10 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M3.8.
| Feb 6, 2023 | 1 km NE of West Seneca, New York | M3.8 | 99 km | 6 km |
| Feb 3, 2001 | 6 km W of Bath, New York | M3.2 | 85 km | 0 km |
| May 25, 1995 | 3 km NW of Amherst, New York | M3.0 | 114 km | 5 km |
| Jun 16, 2004 | 11 km NNW of Angola on the Lake, New York | M2.9 | 101 km | 6 km |
| Jun 5, 2009 | 4 km SSE of Attica, New York | M2.9 | 88 km | 5 km |
| Jun 10, 2025 | 10 km NW of Forksville, Pennsylvania | M2.8 | 148 km | 8 km |
| Mar 8, 2008 | 5 km ENE of Clarence Center, New York | M2.7 | 112 km | 6 km |
| Mar 15, 2022 | 5 km SSW of Warsaw, New York | M2.6 | 75 km | 5 km |
| Dec 17, 1990 | 5 km SSE of Middleboro, Pennsylvania | M2.5 | 148 km | 5 km |
| Jan 25, 1999 | New York | M2.5 | 87 km | 3 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Tornado History
137 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF4. Total: 6 fatalities, 100 injuries.
| Date | Rating | Distance | Path | Fatalities |
| May 31, 1985 | EF4 | 99 km | 69.0 mi | 0 |
| May 31, 1985 | EF4 | 73 km | 29.0 mi | 4 |
| Jul 21, 2003 | EF3 | 36 km | 2.5 mi | 0 |
| May 31, 1985 | EF3 | 74 km | 13.0 mi | 0 |
| Aug 19, 1970 | EF3 | 83 km | 2.3 mi | 0 |
| Jul 24, 1967 | EF3 | 51 km | 11.4 mi | 0 |
| Sep 3, 1963 | EF3 | 76 km | 8.4 mi | 0 |
| May 15, 1961 | EF3 | 23 km | 3.0 mi | 0 |
| Jul 10, 2024 | EF2 | 79 km | 3.2 mi | 0 |
| Jul 28, 2022 | EF2 | 65 km | 10.0 mi | 0 |
| Apr 14, 2019 | EF2 | 83 km | 18.0 mi | 0 |
| Jul 20, 2017 | EF2 | 89 km | 6.1 mi | 0 |
| Jul 24, 2010 | EF2 | 58 km | 7.6 mi | 0 |
| Apr 28, 2002 | EF2 | 37 km | 6.5 mi | 0 |
| Jun 2, 1998 | EF2 | 80 km | 15.0 mi | 0 |
| Jun 13, 1994 | EF2 | 66 km | 3.0 mi | 0 |
| Sep 3, 1993 | EF2 | 39 km | 3.5 mi | 0 |
| Jul 12, 1992 | EF2 | 93 km | 4.0 mi | 0 |
| May 31, 1985 | EF2 | 73 km | 19.0 mi | 0 |
| May 2, 1983 | EF2 | 74 km | 9.8 mi | 0 |
Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).
Wildfire History
5 wildfires (100+ acres) recorded within 100 km. Largest: BULL RUN (2,003 acres, 2008).
| Year | Name | Acres Burned | Distance |
| 2008 | BULL RUN | 2,003 | 91 km |
| 2009 | WOODRUFF | 757 | 76 km |
| 2006 | FIVE MILE FIRE | 658 | 87 km |
| 2021 | UNNAMED | 586 | 98 km |
| 2006 | BEAR TRAP | 561 | 96 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 22°F (-5°C) | 2.4 in | Coldest |
| February | 23°F (-5°C) | 2.3 in | Driest |
| March | 32°F (-0°C) | 2.9 in | |
| April | 43°F (6°C) | 3.3 in | |
| May | 54°F (12°C) | 3.7 in | |
| June | 62°F (17°C) | 4.8 in | Wettest |
| July | 69°F (20°C) | 4.0 in | Warmest |
| August | 65°F (18°C) | 3.8 in | |
| September | 58°F (15°C) | 4.1 in | |
| October | 47°F (9°C) | 3.4 in | |
| November | 37°F (3°C) | 3.6 in | |
| December | 27°F (-3°C) | 3.2 in |
Portville has a seasonal temperature swing of 46°F / from 22°F in January to 69°F in July. Total annual precipitation is 41.5 inches, with June being the wettest month (4.8") and February the driest (2.3").