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Williamstown, PA
Full City Profile · Pennsylvania · Dauphin County County
3.1
/5.0
B
Good
1,289
Population
4,958/sq mi density
$61,875
Median Income
$27,833 per capita
$95,200
Home Value
$133,248 Zillow
$917
Median Rent
23.3% income on rent
51°F
Avg Temperature
275 sunny days/yr
B
Overall
3.1 / 5.0
Good overall score based on economy, affordability, safety and education
B
Economy
3.0 / 5.0
$61,875 median income, 6.1% unemployment
A+
Affordability
5.0 / 5.0
$95,200 home value, $917/mo rent
C+
Safety
2.5 / 5.0
0 violent crimes/100K
C
Education
2.0 / 5.0
12.7% bachelor's degree or higher
Williamstown experiences four distinct seasons with an average annual temperature of 51°F (11°C). Winters average 28°F in January while summers reach 74°F in July. The area gets 275 sunny days per year. Annual precipitation totals 43.1 inches. The area receives 29.0 inches of snow annually. Air quality is rated Good with a median AQI of 40.
Temperature
28°F Jan (-3°C)
74°F Jul (23°C)
| Annual Average | 50.8°F |
| 6% below US avg | |
| January Average | 28°F (-3°C) |
| July Average | 74°F (23°C) |
| Sunny Days | 275 days/yr |
Geography
| Elevation | 756 ft (230 m) |
| Area | 0.3 sq mi (0.7 km²) |
| Population Density | 4,958/sq mi |
| Coordinates | 40.5809°N, 76.6170°W |
| Timezone | America/New_York |
| County | Dauphin County County |
| Nearest Airport | Harrisburg International (MDT) 28 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 40.0 |
| Rating | Good |
Air Pollutants (EPA 2023)
| Ozone (O₃) | 0.0450 ppm |
| PM2.5 (Fine Particles) | 10.7 μg/m³ |
Natural Hazard Risk
| Overall Risk | Relatively Moderate |
| Risk Score | 91.1 / 100 |
| Social Vulnerability | 37.9 / 100 |
| Community Resilience | 96.6 / 100 |
Hazard Breakdown
| Tornado | Relatively Moderate |
| Hurricane | Relatively Moderate |
| Earthquake | Relatively Low |
| Wildfire | Very Low |
| Flood | Relatively High |
| Hail | Very Low |
| Strong Wind | Relatively High |
| Heat Wave | Relatively Moderate |
| Winter Weather | Very High |
| Lightning | Relatively High |
| Ice Storm | Relatively Low |
| Drought | Relatively Low |
| Cold Wave | Relatively Moderate |
| Landslide | Relatively Low |
| Avalanche | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Tsunami History
2 tsunamis recorded within 500 km.
| Year | Location | Cause | Max Wave | Deaths | Distance |
| 1895 | HIGH BRIDGE, NJ | Earthquake | — | — | 147 km |
| 1840 | PHILADELPHIA, PENNSYLVANIA | Earthquake | — | — | 148 km |
Source: NOAA/NCEI Historical Tsunami Database. Sorted by wave height.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 28°F (-3°C) | 2.9 in | Coldest |
| February | 28°F (-2°C) | 2.8 in | Driest |
| March | 37°F (3°C) | 3.2 in | |
| April | 48°F (9°C) | 3.7 in | |
| May | 58°F (14°C) | 4.5 in | |
| June | 66°F (19°C) | 4.5 in | Wettest |
| July | 74°F (23°C) | 4.1 in | Warmest |
| August | 70°F (21°C) | 3.7 in | |
| September | 63°F (17°C) | 4.1 in | |
| October | 52°F (11°C) | 3.3 in | |
| November | 42°F (5°C) | 3.9 in | |
| December | 32°F (0°C) | 3.3 in |
Williamstown has a seasonal temperature swing of 46°F / from 28°F in January to 74°F in July. Total annual precipitation is 43.9 inches, with June being the wettest month (4.5") and February the driest (2.8").