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Weather & Climate in Milroy, PA
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Milroy experiences four distinct seasons with an average annual temperature of 52°F (11°C). Winters average 29°F in January while summers reach 74°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. The area receives 26.2 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 824 feet.
Temperature
29°F Jan (-2°C)
74°F Jul (23°C)
| Annual Average | 51.9°F |
| 4% below US avg | |
| January Average | 29°F (-2°C) |
| July Average | 74°F (23°C) |
| Sunny Days | 275 days/yr |
Geography
| Elevation | 824 ft (251 m) |
| Area | 0.7 sq mi (1.7 km²) |
| Population Density | 1,379/sq mi |
| Coordinates | 40.7194°N, 77.5900°W |
| Timezone | America/New_York |
| County | Mifflin County County |
| Nearest Airport | State College Regional (SCE) 17 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 40.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Relatively Low |
| Risk Score | 69.3 / 100 |
| Social Vulnerability | 93.8 / 100 |
| Community Resilience | 60.4 / 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 | Relatively Low |
| Winter Weather | Relatively Moderate |
| Lightning | Relatively Moderate |
| 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
16 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 | 138 km | 5 km |
| Jan 16, 1994 | 0 km E of Sinking Spring, Pennsylvania | M4.2 | 141 km | 5 km |
| Jun 13, 2019 | 9 km N of Blain, Pennsylvania | M3.4 | 34 km | 27 km |
| Jun 3, 2010 | 4 km ENE of Franklintown, Pennsylvania | M3.1 | 88 km | 2 km |
| Nov 14, 1997 | 0 km S of Rothsville, Pennsylvania | M3.0 | 130 km | 5 km |
| Apr 24, 2009 | 1 km S of Franklintown, Pennsylvania | M2.9 | 87 km | 1 km |
| Jan 16, 1994 | 0 km SSE of Sinking Spring, Pennsylvania | M2.9 | 141 km | 5 km |
| Sep 15, 2019 | 5 km ESE of East Berlin, Pennsylvania | M2.8 | 105 km | 5 km |
| Jun 10, 2025 | 10 km NW of Forksville, Pennsylvania | M2.8 | 121 km | 8 km |
| May 10, 1993 | 1 km NW of Whitfield, Pennsylvania | M2.8 | 139 km | 5 km |
| Oct 25, 2009 | 4 km ENE of Franklintown, Pennsylvania | M2.8 | 87 km | 1 km |
| Mar 11, 1995 | 0 km ENE of Landisville, Pennsylvania | M2.7 | 122 km | 5 km |
| Jan 18, 1994 | 3 km SE of Clay, Pennsylvania | M2.6 | 129 km | 5 km |
| Oct 28, 1996 | 2 km W of Reinholds, Pennsylvania | M2.6 | 132 km | 5 km |
| May 7, 1994 | 2 km SW of Sinking Spring, Pennsylvania | M2.5 | 139 km | 5 km |
| Jan 8, 1995 | 1 km WSW of Montrose Manor, Pennsylvania | M2.5 | 142 km | 5 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Tornado History
212 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF3. Total: 7 fatalities, 104 injuries.
| Date | Rating | Distance | Path | Fatalities |
| Jul 14, 2004 | EF3 | 98 km | 7.5 mi | 0 |
| May 31, 1985 | EF3 | 63 km | 19.0 mi | 6 |
| Jul 29, 1976 | EF3 | 60 km | 25.0 mi | 0 |
| Apr 16, 1961 | EF3 | 75 km | 0.1 mi | 0 |
| Apr 19, 2019 | EF2 | 93 km | 2.9 mi | 0 |
| Apr 19, 2019 | EF2 | 21 km | 4.9 mi | 0 |
| Oct 2, 2018 | EF2 | 98 km | 2.2 mi | 0 |
| May 23, 2011 | EF2 | 35 km | 4.7 mi | 0 |
| Apr 28, 2011 | EF2 | 94 km | 1.1 mi | 0 |
| Apr 28, 2011 | EF2 | 88 km | 2.6 mi | 0 |
| Jul 19, 1996 | EF2 | 100 km | 6.0 mi | 0 |
| Sep 26, 1994 | EF2 | 87 km | 3.5 mi | 0 |
| Oct 9, 1992 | EF2 | 86 km | 2.0 mi | 0 |
| Sep 18, 1991 | EF2 | 20 km | 4.0 mi | 0 |
| Nov 20, 1989 | EF2 | 22 km | 3.5 mi | 0 |
| Jun 20, 1989 | EF2 | 40 km | 2.0 mi | 0 |
| Jul 31, 1985 | EF2 | 85 km | 3.0 mi | 0 |
| Jun 9, 1980 | EF2 | 90 km | 7.4 mi | 0 |
| Jun 7, 1980 | EF2 | 89 km | 5.6 mi | 0 |
| Apr 9, 1980 | EF2 | 23 km | 0.1 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 | 95 km |
| 2018 | FIELDS RUN | 711 | 57 km |
| 2006 | FIVE MILE FIRE | 658 | 73 km |
| 2006 | OKOME ROAD | 573 | 77 km |
| 2006 | BEAR TRAP | 561 | 63 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 29°F (-2°C) | 2.6 in | Driest |
| February | 28°F (-2°C) | 2.8 in | Coldest |
| March | 36°F (2°C) | 3.4 in | |
| April | 47°F (9°C) | 3.3 in | |
| May | 58°F (14°C) | 4.0 in | |
| June | 66°F (19°C) | 4.5 in | Wettest |
| July | 74°F (23°C) | 4.1 in | Warmest |
| August | 69°F (21°C) | 3.4 in | |
| September | 62°F (17°C) | 3.7 in | |
| October | 51°F (10°C) | 3.2 in | |
| November | 41°F (5°C) | 3.5 in | |
| December | 31°F (-1°C) | 3.0 in |
Milroy has a seasonal temperature swing of 46°F / from 28°F in February to 74°F in July. Total annual precipitation is 41.4 inches, with June being the wettest month (4.5") and January the driest (2.6").