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Weather & Climate in Millerstown, PA
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Millerstown experiences four distinct seasons with an average annual temperature of 52°F (11°C). Winters average 28°F in January while summers reach 74°F in July. The area gets 282 sunny days per year, well above the U.S. average of 205 / making it one of the sunnier locations in the country. Air quality is rated Good with a median AQI of 40. The city sits at an elevation of 537 feet.
Temperature
28°F Jan (-2°C)
74°F Jul (23°C)
| Annual Average | 51.8°F |
| 4% below US avg | |
| January Average | 28°F (-2°C) |
| July Average | 74°F (23°C) |
| Sunny Days | 282 days/yr |
Geography
| Elevation | 537 ft (164 m) |
| Area | 0.4 sq mi (0.9 km²) |
| Population Density | 825/sq mi |
| Coordinates | 40.5557°N, 77.1515°W |
| Timezone | America/New_York |
| County | Perry County County |
| Nearest Airport | Harrisburg International (MDT) 32 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 40.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Relatively Low |
| Risk Score | 53.1 / 100 |
| Social Vulnerability | 33.6 / 100 |
| Community Resilience | 67.8 / 100 |
Hazard Breakdown
| Tornado | Relatively Low |
| Hurricane | Relatively Low |
| Earthquake | Very Low |
| Wildfire | Very Low |
| Flood | Relatively Low |
| Hail | Very Low |
| Strong Wind | Relatively Moderate |
| Heat Wave | Relatively Low |
| Winter Weather | Relatively Moderate |
| Lightning | Relatively Low |
| Ice Storm | Very Low |
| Drought | Very Low |
| Cold Wave | Very Low |
| Landslide | Relatively Low |
| Avalanche | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Earthquake History
24 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 | 98 km | 5 km |
| Jan 16, 1994 | 0 km E of Sinking Spring, Pennsylvania | M4.2 | 100 km | 5 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 | 33 km | 27 km |
| Jun 3, 2010 | 4 km ENE of Franklintown, Pennsylvania | M3.1 | 54 km | 2 km |
| Jan 17, 2016 | 3 km NE of Ranson, West Virginia | M3.0 | 149 km | 5 km |
| Nov 14, 1997 | 0 km S of Rothsville, Pennsylvania | M3.0 | 89 km | 5 km |
| Apr 24, 2009 | 1 km S of Franklintown, Pennsylvania | M2.9 | 56 km | 1 km |
| Jan 16, 1994 | 0 km SSE of Sinking Spring, Pennsylvania | M2.9 | 100 km | 5 km |
| Sep 15, 2019 | 5 km ESE of East Berlin, Pennsylvania | M2.8 | 73 km | 5 km |
| Jun 10, 2025 | 10 km NW of Forksville, Pennsylvania | M2.8 | 119 km | 8 km |
| May 10, 1993 | 1 km NW of Whitfield, Pennsylvania | M2.8 | 99 km | 5 km |
| Oct 25, 2009 | 4 km ENE of Franklintown, Pennsylvania | M2.8 | 53 km | 1 km |
| Mar 15, 1993 | 5 km W of Columbia, Maryland | M2.7 | 149 km | 5 km |
| Oct 28, 1994 | 1 km E of Mount Vernon, Maryland | M2.7 | 147 km | — |
| Mar 11, 1995 | 0 km ENE of Landisville, Pennsylvania | M2.7 | 81 km | 5 km |
| Jan 25, 2015 | 4 km ESE of Downingtown, Pennsylvania | M2.6 | 141 km | 2 km |
| Jan 13, 1990 | 6 km ENE of Eldersburg, Maryland | M2.6 | 128 km | 5 km |
| Jun 25, 2021 | 2 km SE of Woodlawn, Maryland | M2.6 | 144 km | 3 km |
| Jan 18, 1994 | 3 km SE of Clay, Pennsylvania | M2.6 | 88 km | 5 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Tornado History
283 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF3. Total: 8 fatalities, 142 injuries.
| Date | Rating | Distance | Path | Fatalities |
| Jul 14, 2004 | EF3 | 57 km | 7.5 mi | 0 |
| May 31, 1985 | EF3 | 69 km | 19.0 mi | 6 |
| May 22, 1983 | EF3 | 96 km | 2.0 mi | 0 |
| Jun 7, 1980 | EF3 | 71 km | 1.5 mi | 0 |
| Jul 29, 1976 | EF3 | 72 km | 25.0 mi | 0 |
| Jun 18, 1970 | EF3 | 74 km | 1.9 mi | 1 |
| Apr 16, 1961 | EF3 | 64 km | 0.1 mi | 0 |
| Apr 5, 1952 | EF3 | 85 km | 17.5 mi | 0 |
| Nov 4, 1950 | EF3 | 96 km | 15.9 mi | 0 |
| Apr 19, 2019 | EF2 | 94 km | 2.9 mi | 0 |
| Apr 19, 2019 | EF2 | 39 km | 4.9 mi | 0 |
| Apr 14, 2019 | EF2 | 94 km | 3.7 mi | 0 |
| May 23, 2011 | EF2 | 11 km | 4.7 mi | 0 |
| Apr 28, 2011 | EF2 | 53 km | 1.1 mi | 0 |
| Apr 28, 2011 | EF2 | 54 km | 2.6 mi | 0 |
| Sep 24, 2001 | EF2 | 93 km | 5.0 mi | 0 |
| May 29, 1995 | EF2 | 88 km | 2.5 mi | 0 |
| Apr 30, 1994 | EF2 | 94 km | 6.0 mi | 0 |
| Oct 9, 1992 | EF2 | 51 km | 2.0 mi | 0 |
| Jul 17, 1992 | EF2 | 68 km | 1.0 mi | 0 |
Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).
Wildfire History
3 wildfires (100+ acres) recorded within 100 km. Largest: FIELDS RUN (711 acres, 2018).
| Year | Name | Acres Burned | Distance |
| 2018 | FIELDS RUN | 711 | 94 km |
| 2006 | OKOME ROAD | 573 | 95 km |
| 2006 | BEAR TRAP | 561 | 97 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 28°F (-2°C) | 2.7 in | Coldest, Driest |
| February | 30°F (-1°C) | 2.7 in | |
| March | 39°F (4°C) | 3.3 in | |
| April | 49°F (10°C) | 3.4 in | |
| May | 60°F (15°C) | 4.1 in | |
| June | 68°F (20°C) | 4.3 in | Wettest |
| July | 74°F (23°C) | 3.8 in | Warmest |
| August | 71°F (22°C) | 3.5 in | |
| September | 64°F (18°C) | 3.9 in | |
| October | 53°F (11°C) | 3.4 in | |
| November | 42°F (6°C) | 3.6 in | |
| December | 33°F (0°C) | 3.2 in |
Millerstown has a seasonal temperature swing of 45°F / from 28°F in January to 74°F in July. Total annual precipitation is 41.8 inches, with June being the wettest month (4.3") and January the driest (2.7").