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Port Penn, DE
Full City Profile · Delaware · New Castle County County
3.8
/5.0
B+
Good
477
Population
1,193/sq mi density
$95,287
Median Income
$26,758 per capita
$388,500
Home Value
$294,106 Zillow
56°F
Avg Temperature
293 sunny days/yr
289
Violent Crime/100K
3,464 property/100K
B+
Overall
3.8 / 5.0
Good overall score based on economy, affordability, safety and education
A+
Economy
4.9 / 5.0
$95,287 median income, 0.0% unemployment
A
Affordability
4.4 / 5.0
$388,500 home value, /mo rent
F
Safety
1.0 / 5.0
289 violent crimes/100K
A+
Education
5.0 / 5.0
0.0% bachelor's degree or higher
Port Penn enjoys a temperate climate with an average annual temperature of 56°F (13°C). Winters average 34°F in January while summers reach 78°F in July. The area gets 293 sunny days per year. Annual precipitation totals 45.3 inches. The area receives 20.2 inches of snow annually. Air quality is rated Good with a median AQI of 41.
Temperature
34°F Jan (1°C)
78°F Jul (25°C)
| Annual Average | 55.5°F |
| 3% above US avg | |
| January Average | 34°F (1°C) |
| July Average | 78°F (25°C) |
| Sunny Days | 293 days/yr |
Geography
| Elevation | 6 ft (2 m) |
| Area | 0.4 sq mi (1.0 km²) |
| Population Density | 1,193/sq mi |
| Coordinates | 39.5152°N, 75.5814°W |
| Timezone | America/New_York |
| County | New Castle County County |
| Nearest Airport | Philadelphia International (PHL) 31 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 41.0 |
| Rating | Good |
Air Pollutants (EPA 2023)
| Ozone (O₃) | 0.0452 ppm |
| NO₂ (Nitrogen Dioxide) | 13.7 ppb |
| SO₂ (Sulfur Dioxide) | 0.34 ppb |
| PM2.5 (Fine Particles) | 8.9 μg/m³ |
Natural Hazard Risk
| Overall Risk | Relatively High |
| Risk Score | 95.3 / 100 |
| Social Vulnerability | 28.5 / 100 |
| Community Resilience | 83.1 / 100 |
Hazard Breakdown
| Tornado | Relatively Moderate |
| Hurricane | Relatively Moderate |
| Earthquake | Relatively Moderate |
| Wildfire | Very Low |
| Flood | Relatively High |
| Hail | Very Low |
| Strong Wind | Relatively High |
| Heat Wave | Relatively Moderate |
| Winter Weather | Very High |
| Lightning | Relatively Moderate |
| Ice Storm | Relatively High |
| Drought | Relatively Moderate |
| Cold Wave | Relatively High |
| Landslide | Relatively Low |
| Coastal Flood | Relatively High |
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 | — | — | 141 km |
| 1840 | PHILADELPHIA, PENNSYLVANIA | Earthquake | — | — | 46 km |
Source: NOAA/NCEI Historical Tsunami Database. Sorted by wave height.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 34°F (1°C) | 3.6 in | Coldest |
| February | 34°F (1°C) | 2.8 in | Driest |
| March | 43°F (6°C) | 4.1 in | |
| April | 52°F (11°C) | 3.7 in | |
| May | 62°F (17°C) | 4.3 in | |
| June | 71°F (22°C) | 3.9 in | |
| July | 78°F (25°C) | 4.5 in | Warmest, Wettest |
| August | 75°F (24°C) | 4.0 in | |
| September | 68°F (20°C) | 4.2 in | |
| October | 57°F (14°C) | 3.3 in | |
| November | 47°F (8°C) | 3.4 in | |
| December | 38°F (3°C) | 3.6 in |
Port Penn has a seasonal temperature swing of 44°F / from 34°F in January to 78°F in July. Total annual precipitation is 45.2 inches, with July being the wettest month (4.5") and February the driest (2.8").