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Weather & Climate in Clay, PA
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Clay experiences four distinct seasons with an average annual temperature of 53°F (12°C). Winters average 31°F in January while summers reach 75°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 42.1 inches. Air quality is rated Good with a median AQI of 40. The city sits at an elevation of 394 feet.
Temperature
31°F Jan (-1°C)
75°F Jul (24°C)
| Annual Average | 53.3°F |
| 1% below US avg | |
| January Average | 31°F (-1°C) |
| July Average | 75°F (24°C) |
| Sunny Days | 275 days/yr |
Geography
| Elevation | 394 ft (120 m) |
| Area | 2.2 sq mi (5.8 km²) |
| Population Density | 704/sq mi |
| Coordinates | 40.2190°N, 76.2390°W |
| Timezone | America/New_York |
| County | Lancaster County County |
| Nearest Airport | Reading Regional/Carl A Spaatz Field (RDG) 18 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 40.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Relatively High |
| Risk Score | 95.0 / 100 |
| Social Vulnerability | 43.5 / 100 |
| Community Resilience | 70.1 / 100 |
Hazard Breakdown
| Tornado | Relatively Moderate |
| Hurricane | Relatively High |
| Earthquake | Relatively Moderate |
| Wildfire | Very Low |
| Flood | Relatively High |
| Hail | Relatively Moderate |
| Strong Wind | Relatively High |
| Heat Wave | Relatively Moderate |
| Winter Weather | Very High |
| Lightning | Relatively High |
| Ice Storm | Relatively Moderate |
| Drought | Relatively Moderate |
| Cold Wave | Relatively High |
| Landslide | Relatively Low |
| Avalanche | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Earthquake History
34 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M4.8.
| Apr 5, 2024 | 2024 Tewksbury, New Jersey Earthquake | M4.8 | 136 km | 3 km |
| Jan 16, 1994 | 2 km W of Sinking Spring, Pennsylvania | M4.6 | 21 km | 5 km |
| Jan 16, 1994 | 0 km E of Sinking Spring, Pennsylvania | M4.2 | 23 km | 5 km |
| Apr 5, 2024 | 7 km WSW of Gladstone, New Jersey | M3.7 | 137 km | 4 km |
| Jul 16, 2010 | 5 km NNW of Barnesville, Maryland | M3.6 | 146 km | 7 km |
| Jun 13, 2019 | 9 km N of Blain, Pennsylvania | M3.4 | 110 km | 27 km |
| Oct 23, 1990 | 3 km W of Hancocks Bridge, New Jersey | M3.2 | 101 km | 10 km |
| Aug 26, 2003 | 4 km NNW of Milford, New Jersey | M3.1 | 105 km | 3 km |
| Jun 3, 2010 | 4 km ENE of Franklintown, Pennsylvania | M3.1 | 64 km | 2 km |
| Nov 14, 1997 | 0 km S of Rothsville, Pennsylvania | M3.0 | 8 km | 5 km |
| Apr 24, 2009 | 1 km S of Franklintown, Pennsylvania | M2.9 | 69 km | 1 km |
| Apr 27, 2024 | 7 km WSW of Gladstone, New Jersey | M2.9 | 137 km | 5 km |
| May 24, 2024 | 6 km E of Califon, New Jersey | M2.9 | 137 km | 7 km |
| Jan 16, 1994 | 0 km SSE of Sinking Spring, Pennsylvania | M2.9 | 23 km | 5 km |
| Sep 15, 2019 | 5 km ESE of East Berlin, Pennsylvania | M2.8 | 66 km | 5 km |
| May 10, 1993 | 1 km NW of Whitfield, Pennsylvania | M2.8 | 24 km | 5 km |
| Jul 1, 2009 | 3 km ESE of Pennsville, New Jersey | M2.8 | 91 km | 5 km |
| Oct 25, 2009 | 4 km ENE of Franklintown, Pennsylvania | M2.8 | 64 km | 1 km |
| Oct 28, 1994 | 1 km E of Mount Vernon, Maryland | M2.7 | 107 km | - |
| Mar 11, 1995 | 0 km ENE of Landisville, Pennsylvania | M2.7 | 19 km | 5 km |
Source: USGS Earthquake Catalog (M2.5+, 1990-2025). Sorted by magnitude.
Hurricane History
2 hurricanes (Category 1+) recorded within 500 km since 1980. Strongest on record: Category 2.
| Year | Name | Category | Max Wind | Closest |
| 2011 | Irene | Category 1 | 75 mph | 259 km |
| 1985 | Gloria | Category 2 | 98 mph | 226 km |
Source: NOAA IBTrACS (Category 1+, 1980-2026).
Tornado History
417 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF3. Total: 9 fatalities, 327 injuries.
| Date | Rating | Distance | Path | Fatalities |
| Jul 14, 2004 | EF3 | 30 km | 7.5 mi | 0 |
| May 31, 1998 | EF3 | 41 km | 8.3 mi | 0 |
| Jul 27, 1994 | EF3 | 67 km | 4.0 mi | 0 |
| Jul 27, 1994 | EF3 | 61 km | 2.0 mi | 3 |
| Jul 26, 1981 | EF3 | 83 km | 3.3 mi | 0 |
| Jun 7, 1980 | EF3 | 74 km | 1.5 mi | 0 |
| Jun 18, 1970 | EF3 | 21 km | 1.9 mi | 1 |
| Apr 28, 1961 | EF3 | 84 km | 0.3 mi | 0 |
| Mar 22, 1955 | EF3 | 60 km | 9.6 mi | 1 |
| Apr 5, 1952 | EF3 | 78 km | 17.5 mi | 0 |
| Nov 4, 1950 | EF3 | 10 km | 15.9 mi | 0 |
| Sep 1, 2021 | EF2 | 55 km | 5.9 mi | 0 |
| Sep 1, 2021 | EF2 | 86 km | 8.3 mi | 1 |
| Oct 31, 2019 | EF2 | 70 km | 0.5 mi | 0 |
| May 28, 2019 | EF2 | 29 km | 3.1 mi | 0 |
| Feb 24, 2016 | EF2 | 29 km | 4.9 mi | 0 |
| May 23, 2011 | EF2 | 94 km | 4.7 mi | 0 |
| Apr 28, 2011 | EF2 | 60 km | 2.6 mi | 0 |
| Apr 28, 2011 | EF2 | 34 km | 1.1 mi | 0 |
| Dec 1, 2006 | EF2 | 97 km | 20.0 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 | - | - | 125 km |
| 1840 | PHILADELPHIA, PENNSYLVANIA | Earthquake | - | - | 100 km |
Source: NOAA/NCEI Historical Tsunami Database.
Wildfire History
2 wildfires (100+ acres) recorded within 100 km. Largest: HOPEWELL FIRE (812 acres, 2012).
| Year | Name | Acres Burned | Distance |
| 2012 | HOPEWELL FIRE | 812 | 42 km |
| 2015 | RAZOR FIRE | 728 | 78 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 31°F (-1°C) | 3.2 in | |
| February | 30°F (-1°C) | 2.6 in | Coldest, Driest |
| March | 39°F (4°C) | 3.2 in | |
| April | 50°F (10°C) | 3.6 in | |
| May | 60°F (16°C) | 4.3 in | |
| June | 69°F (20°C) | 4.3 in | |
| July | 75°F (24°C) | 4.4 in | Warmest, Wettest |
| August | 72°F (22°C) | 3.7 in | |
| September | 65°F (18°C) | 3.8 in | |
| October | 54°F (12°C) | 3.2 in | |
| November | 44°F (7°C) | 3.7 in | |
| December | 34°F (1°C) | 3.4 in |
Clay has a seasonal temperature swing of 45°F / from 30°F in February to 75°F in July. Total annual precipitation is 43.1 inches, with July being the wettest month (4.4") and February the driest (2.6").