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Weather & Climate in Port Royal, PA
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Port Royal experiences four distinct seasons with an average annual temperature of 48°F (9°C). Winters average 24°F in January while summers reach 71°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. The area receives 35.3 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 482 feet.
Temperature
24°F Jan (-5°C)
71°F Jul (22°C)
| Annual Average | 48.1°F |
| 11% below US avg | |
| January Average | 24°F (-5°C) |
| July Average | 71°F (22°C) |
| Sunny Days | 275 days/yr |
Geography
| Elevation | 482 ft (147 m) |
| Area | 0.2 sq mi (0.6 km²) |
| Population Density | 1,257/sq mi |
| Coordinates | 40.5338°N, 77.3895°W |
| Timezone | America/New_York |
| County | Juniata County County |
| Nearest Airport | State College Regional (SCE) 33 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 40.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Very Low |
| Risk Score | 38.8 / 100 |
| Social Vulnerability | 81.2 / 100 |
| Community Resilience | 57.9 / 100 |
Hazard Breakdown
| Tornado | Relatively Low |
| Hurricane | Relatively Low |
| Earthquake | Very Low |
| Wildfire | Very Low |
| Flood | Relatively Low |
| Hail | Very Low |
| Strong Wind | Relatively Low |
| Heat Wave | Very Low |
| Winter Weather | Relatively Moderate |
| Lightning | Relatively Low |
| Ice Storm | Very Low |
| Drought | No Rating |
| Cold Wave | Very Low |
| Landslide | Relatively Low |
| Avalanche | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Earthquake History
20 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M4.6.
| Jan 16, 1994 | 2 km W of Sinking Spring, Pennsylvania | M4.6 | 117 km | 5 km |
| Jan 16, 1994 | 0 km E of Sinking Spring, Pennsylvania | M4.2 | 119 km | 5 km |
| Jul 16, 2010 | 5 km NNW of Barnesville, Maryland | M3.6 | 142 km | 7 km |
| Jun 13, 2019 | 9 km N of Blain, Pennsylvania | M3.4 | 16 km | 27 km |
| Jun 3, 2010 | 4 km ENE of Franklintown, Pennsylvania | M3.1 | 61 km | 2 km |
| Jan 17, 2016 | 3 km NE of Ranson, West Virginia | M3.0 | 140 km | 5 km |
| Nov 14, 1997 | 0 km S of Rothsville, Pennsylvania | M3.0 | 106 km | 5 km |
| Apr 24, 2009 | 1 km S of Franklintown, Pennsylvania | M2.9 | 61 km | 1 km |
| Jan 16, 1994 | 0 km SSE of Sinking Spring, Pennsylvania | M2.9 | 119 km | 5 km |
| Sep 15, 2019 | 5 km ESE of East Berlin, Pennsylvania | M2.8 | 79 km | 5 km |
| Jun 10, 2025 | 10 km NW of Forksville, Pennsylvania | M2.8 | 129 km | 8 km |
| May 10, 1993 | 1 km NW of Whitfield, Pennsylvania | M2.8 | 118 km | 5 km |
| Oct 25, 2009 | 4 km ENE of Franklintown, Pennsylvania | M2.8 | 60 km | 1 km |
| Mar 11, 1995 | 0 km ENE of Landisville, Pennsylvania | M2.7 | 97 km | 5 km |
| Oct 28, 1996 | 2 km W of Reinholds, Pennsylvania | M2.6 | 110 km | 5 km |
| Jan 18, 1994 | 3 km SE of Clay, Pennsylvania | M2.6 | 106 km | 5 km |
| Jun 25, 2021 | 2 km SE of Woodlawn, Maryland | M2.6 | 149 km | 3 km |
| Jan 13, 1990 | 6 km ENE of Eldersburg, Maryland | M2.6 | 131 km | 5 km |
| May 7, 1994 | 2 km SW of Sinking Spring, Pennsylvania | M2.5 | 117 km | 5 km |
| Jan 8, 1995 | 1 km WSW of Montrose Manor, Pennsylvania | M2.5 | 121 km | 5 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Tornado History
257 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF3. Total: 8 fatalities, 131 injuries.
| Date | Rating | Distance | Path | Fatalities |
| Jul 14, 2004 | EF3 | 74 km | 7.5 mi | 0 |
| May 31, 1985 | EF3 | 75 km | 19.0 mi | 6 |
| May 22, 1983 | EF3 | 94 km | 2.0 mi | 0 |
| Jun 7, 1980 | EF3 | 74 km | 1.5 mi | 0 |
| Jul 29, 1976 | EF3 | 75 km | 25.0 mi | 0 |
| Jun 18, 1970 | EF3 | 93 km | 1.9 mi | 1 |
| Apr 16, 1961 | EF3 | 55 km | 0.1 mi | 0 |
| Apr 5, 1952 | EF3 | 89 km | 17.5 mi | 0 |
| Apr 19, 2019 | EF2 | 19 km | 4.9 mi | 0 |
| Apr 19, 2019 | EF2 | 80 km | 2.9 mi | 0 |
| May 23, 2011 | EF2 | 21 km | 4.7 mi | 0 |
| Apr 28, 2011 | EF2 | 62 km | 2.6 mi | 0 |
| Apr 28, 2011 | EF2 | 72 km | 1.1 mi | 0 |
| Sep 24, 2001 | EF2 | 96 km | 5.0 mi | 0 |
| Apr 30, 1994 | EF2 | 85 km | 6.0 mi | 0 |
| Oct 9, 1992 | EF2 | 59 km | 2.0 mi | 0 |
| Jul 17, 1992 | EF2 | 87 km | 1.0 mi | 0 |
| Sep 18, 1991 | EF2 | 39 km | 4.0 mi | 0 |
| May 6, 1991 | EF2 | 79 km | 1.0 mi | 0 |
| Jun 8, 1990 | EF2 | 90 km | 1.0 mi | 0 |
Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).
Wildfire History
4 wildfires (100+ acres) recorded within 100 km. Largest: FIELDS RUN (711 acres, 2018).
| Year | Name | Acres Burned | Distance |
| 2018 | FIELDS RUN | 711 | 83 km |
| 2006 | FIVE MILE FIRE | 658 | 98 km |
| 2006 | OKOME ROAD | 573 | 95 km |
| 2006 | BEAR TRAP | 561 | 89 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 24°F (-5°C) | 2.6 in | Coldest, Driest |
| February | 30°F (-1°C) | 2.7 in | |
| March | 38°F (4°C) | 3.3 in | |
| April | 49°F (10°C) | 3.3 in | |
| May | 59°F (15°C) | 4.1 in | |
| June | 68°F (20°C) | 4.3 in | Wettest |
| July | 71°F (22°C) | 4.0 in | Warmest |
| August | 71°F (22°C) | 3.4 in | |
| September | 64°F (18°C) | 3.6 in | |
| October | 52°F (11°C) | 3.2 in | |
| November | 42°F (6°C) | 3.5 in | |
| December | 32°F (0°C) | 3.0 in |
Port Royal has a seasonal temperature swing of 48°F / from 24°F in January to 71°F in July. Total annual precipitation is 40.8 inches, with June being the wettest month (4.3") and January the driest (2.6").