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Weather & Climate in Westwood CDP (Chester County), PA
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Westwood CDP (Chester County) experiences four distinct seasons with an average annual temperature of 53°F (12°C). Winters average 30°F in January while summers reach 75°F in July. The area gets 290 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 52.1 inches (wetter than the 38-inch national average). The area receives 31.9 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 379 feet.
Temperature
30°F Jan (-1°C)
75°F Jul (24°C)
| Annual Average | 52.8°F |
| 2% below US avg | |
| January Average | 30°F (-1°C) |
| July Average | 75°F (24°C) |
| Sunny Days | 290 days/yr |
Geography
| Elevation | 379 ft (116 m) |
| Area | 0.5 sq mi (1.2 km²) |
| Population Density | 3,113/sq mi |
| Coordinates | 39.9702°N, 75.8553°W |
| Timezone | America/New_York |
| County | Chester County County |
| Nearest Airport | Reading Regional/Carl A Spaatz Field (RDG) 29 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 40.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Relatively Moderate |
| Risk Score | 91.9 / 100 |
| Social Vulnerability | 10.6 / 100 |
| Community Resilience | 85.2 / 100 |
Hazard Breakdown
| Tornado | Relatively Moderate |
| Hurricane | Relatively Moderate |
| Earthquake | Relatively Moderate |
| Wildfire | Very Low |
| Flood | Relatively High |
| Hail | Relatively Low |
| Strong Wind | Relatively High |
| Heat Wave | Relatively Moderate |
| Winter Weather | Very High |
| Lightning | Relatively High |
| Ice Storm | Relatively High |
| Drought | Relatively High |
| Cold Wave | Relatively Moderate |
| Landslide | Relatively Low |
| Coastal Flood | No Rating |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Earthquake History
35 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M4.8.
| Apr 5, 2024 | 2024 Tewksbury, New Jersey Earthquake | M4.8 | 123 km | 3 km |
| Jan 16, 1994 | 2 km W of Sinking Spring, Pennsylvania | M4.6 | 43 km | 5 km |
| Jan 16, 1994 | 0 km E of Sinking Spring, Pennsylvania | M4.2 | 42 km | 5 km |
| Apr 5, 2024 | 7 km WSW of Gladstone, New Jersey | M3.7 | 124 km | 4 km |
| Jun 13, 2019 | 9 km N of Blain, Pennsylvania | M3.4 | 149 km | 27 km |
| Oct 23, 1990 | 3 km W of Hancocks Bridge, New Jersey | M3.2 | 59 km | 10 km |
| Jan 9, 1992 | 4 km WNW of Robertsville, New Jersey | M3.1 | 136 km | 8 km |
| Aug 26, 2003 | 4 km NNW of Milford, New Jersey | M3.1 | 95 km | 3 km |
| Jun 3, 2010 | 4 km ENE of Franklintown, Pennsylvania | M3.1 | 96 km | 2 km |
| Nov 14, 1997 | 0 km S of Rothsville, Pennsylvania | M3.0 | 39 km | 5 km |
| Apr 24, 2009 | 1 km S of Franklintown, Pennsylvania | M2.9 | 100 km | 1 km |
| Apr 27, 2024 | 7 km WSW of Gladstone, New Jersey | M2.9 | 123 km | 5 km |
| May 24, 2024 | 6 km E of Califon, New Jersey | M2.9 | 124 km | 7 km |
| Jan 16, 1994 | 0 km SSE of Sinking Spring, Pennsylvania | M2.9 | 41 km | 5 km |
| Sep 15, 2019 | 5 km ESE of East Berlin, Pennsylvania | M2.8 | 90 km | 5 km |
| May 10, 1993 | 1 km NW of Whitfield, Pennsylvania | M2.8 | 44 km | 5 km |
| Jul 1, 2009 | 3 km ESE of Pennsville, New Jersey | M2.8 | 48 km | 5 km |
| Oct 25, 2009 | 4 km ENE of Franklintown, Pennsylvania | M2.8 | 97 km | 1 km |
| Mar 11, 1995 | 0 km ENE of Landisville, Pennsylvania | M2.7 | 49 km | 5 km |
| Oct 28, 1994 | 1 km E of Mount Vernon, Maryland | M2.7 | 98 km | — |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Hurricane History
5 hurricanes (Category 1+) recorded within 500 km since 1980. Strongest on record: Category 2.
| Year | Name | Category | Max Wind | Closest |
| 2012 | Sandy | Category 1 | 92 mph | 295 km |
| 2011 | Irene | Category 1 | 75 mph | 221 km |
| 1991 | Bob | Category 3 | 109 mph | 273 km |
| 1986 | Charley | Category 1 | 75 mph | 291 km |
| 1985 | Gloria | Category 2 | 98 mph | 192 km |
Source: NOAA IBTrACS (Category 1+, 1980–2026).
Tornado History
416 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF3. Total: 13 fatalities, 368 injuries.
| Date | Rating | Distance | Path | Fatalities |
| Sep 1, 2021 | EF3 | 61 km | 12.4 mi | 0 |
| Jul 29, 2021 | EF3 | 75 km | 3.4 mi | 0 |
| Jul 14, 2004 | EF3 | 71 km | 7.5 mi | 0 |
| May 31, 1998 | EF3 | 57 km | 8.3 mi | 0 |
| Jul 27, 1994 | EF3 | 41 km | 2.0 mi | 3 |
| Jul 27, 1994 | EF3 | 28 km | 4.0 mi | 0 |
| Jul 26, 1981 | EF3 | 92 km | 3.3 mi | 0 |
| Jun 7, 1980 | EF3 | 99 km | 1.5 mi | 0 |
| Jun 18, 1970 | EF3 | 61 km | 1.9 mi | 1 |
| Apr 28, 1961 | EF3 | 41 km | 0.3 mi | 0 |
| Jun 24, 1960 | EF3 | 98 km | 12.9 mi | 0 |
| Mar 22, 1955 | EF3 | 20 km | 9.6 mi | 1 |
| Apr 5, 1952 | EF3 | 98 km | 17.5 mi | 0 |
| Nov 4, 1950 | EF3 | 34 km | 15.9 mi | 0 |
| Sep 1, 2021 | EF2 | 55 km | 8.3 mi | 1 |
| Sep 1, 2021 | EF2 | 24 km | 5.9 mi | 0 |
| Jul 29, 2021 | EF2 | 88 km | 6.3 mi | 0 |
| Aug 4, 2020 | EF2 | 77 km | 20.8 mi | 0 |
| Oct 31, 2019 | EF2 | 29 km | 0.5 mi | 0 |
| May 28, 2019 | EF2 | 22 km | 3.1 mi | 0 |
Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).
Tsunami History
2 tsunamis recorded within 500 km.
| Year | Location | Cause | Max Wave | Deaths | Distance |
| 1895 | HIGH BRIDGE, NJ | Earthquake | — | — | 113 km |
| 1840 | PHILADELPHIA, PENNSYLVANIA | Earthquake | — | — | 59 km |
Source: NOAA/NCEI Historical Tsunami Database.
Wildfire History
20 wildfires (100+ acres) recorded within 100 km. Largest: UNNAMED (2,367 acres, 1990).
| Year | Name | Acres Burned | Distance |
| 1990 | UNNAMED | 2,367 | 95 km |
| 1996 | UNNAMED | 2,122 | 94 km |
| 1993 | UNNAMED | 1,860 | 94 km |
| 2008 | SAUNDERS DITCH | 1,814 | 98 km |
| 1985 | UNNAMED | 1,685 | 94 km |
| 2020 | SPLIT DITCH | 1,518 | 97 km |
| 2020 | BIG TIMBER | 1,434 | 89 km |
| 2014 | RAILROAD | 1,431 | 97 km |
| 1991 | KENTIS WEST | 1,273 | 90 km |
| 1988 | BOMBAY ISLAND | 1,020 | 87 km |
| 2014 | DEGOLIA | 861 | 95 km |
| 2012 | HOPEWELL FIRE | 812 | 29 km |
| 2002 | FIVE MILE FIRE | 732 | 92 km |
| 2015 | RAZOR FIRE | 728 | 91 km |
| 2023 | DRAGWAY | 703 | 92 km |
| 1985 | BOMBAY HOOK | 669 | 88 km |
| 2001 | UNNAMED | 592 | 94 km |
| 1986 | UNNAMED | 557 | 97 km |
| 2024 | COUNTY LINE WILDFIRE | 515 | 93 km |
| 2023 | BUZBY BOGGS | 501 | 83 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 30°F (-1°C) | 3.5 in | Coldest |
| February | 31°F (-1°C) | 2.8 in | Driest |
| March | 40°F (4°C) | 3.7 in | |
| April | 50°F (10°C) | 3.8 in | |
| May | 60°F (16°C) | 4.4 in | |
| June | 69°F (20°C) | 4.3 in | |
| July | 75°F (24°C) | 4.5 in | Warmest, Wettest |
| August | 73°F (23°C) | 3.9 in | |
| September | 66°F (19°C) | 4.1 in | |
| October | 54°F (12°C) | 3.4 in | |
| November | 44°F (7°C) | 3.8 in | |
| December | 35°F (2°C) | 3.7 in |
Westwood CDP (Chester County) has a seasonal temperature swing of 45°F / from 30°F in January to 75°F in July. Total annual precipitation is 45.8 inches, with July being the wettest month (4.5") and February the driest (2.8").