Henlopen Acres, DE
Full City Profile · Delaware · Sussex County County
5.0
/5.0
A+
Excellent
191
Population
735/sq mi density
$2,000,001
Home Value
$795,948 Zillow
59°F
Avg Temperature
A+
Overall
5.0 / 5.0
Strong
A+
Education
5.0 / 5.0
74.4% bachelor's degree or higher
Henlopen Acres enjoys a temperate climate with an average annual temperature of 59°F (15°C). Winters average 38°F in January while summers reach 79°F in July. Annual precipitation totals 47.3 inches. The area receives 10.5 inches of snow annually. Air quality is rated Good with a median AQI of 40.
Temperature
38°F Jan (3°C)
79°F Jul (26°C)
| Annual Average | 58.5°F |
| 8% above US avg | |
| January Average | 38°F (3°C) |
| July Average | 79°F (26°C) |
Geography
| Elevation | 17 ft (5 m) |
| Area | 0.3 sq mi (0.7 km²) |
| Population Density | 735/sq mi |
| Coordinates | 38.7256°N, 75.0850°W |
| Timezone | America/New_York |
| County | Sussex County County |
| Nearest Airport | Salisbury-Ocean City Wicomico Regional (SBY) 35 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 40.0 |
| Rating | Good |
| Good Days % | 81.6% |
| Unhealthy Days | 0 |
Air Pollutants (EPA 2023)
| Ozone (O₃) | 0.0463 ppm |
| SO₂ (Sulfur Dioxide) | 0.20 ppb |
| PM2.5 (Fine Particles) | 8.6 μg/m³ |
Natural Hazard Risk
| Overall Risk | Relatively Moderate |
| Risk Score | 94.2 / 100 |
| Social Vulnerability | 70.4 / 100 |
| Community Resilience | 59.8 / 100 |
Hazard Breakdown
| Tornado | Relatively Low |
| Hurricane | Relatively High |
| Earthquake | Relatively Low |
| Wildfire | Relatively Low |
| Flood | Relatively Moderate |
| Hail | Relatively Low |
| Strong Wind | Relatively High |
| Heat Wave | Relatively Moderate |
| Winter Weather | Very High |
| Lightning | Relatively High |
| Ice Storm | Relatively Moderate |
| Drought | Relatively Moderate |
| Cold Wave | Relatively High |
| Landslide | Very Low |
| Coastal Flood | Very High |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Tsunami History
1 tsunami recorded within 500 km.
| Year | Location | Cause | Max Wave | Deaths | Distance |
| 1840 | PHILADELPHIA, PENNSYLVANIA | Earthquake | - | - | 120 km |
Source: NOAA/NCEI Historical Tsunami Database. Sorted by wave height.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 38°F (3°C) | 3.4 in | Coldest |
| February | 40°F (4°C) | 3.2 in | Driest |
| March | 46°F (8°C) | 4.2 in | |
| April | 56°F (14°C) | 3.5 in | |
| May | 65°F (19°C) | 3.4 in | |
| June | 75°F (24°C) | 3.8 in | |
| July | 79°F (26°C) | 5.0 in | Warmest, Wettest |
| August | 77°F (25°C) | 4.3 in | |
| September | 72°F (22°C) | 4.5 in | |
| October | 61°F (16°C) | 4.4 in | |
| November | 50°F (10°C) | 3.6 in | |
| December | 42°F (6°C) | 4.2 in |
Henlopen Acres has a seasonal temperature swing of 41°F / from 38°F in January to 79°F in July. Total annual precipitation is 47.3 inches, with July being the wettest month (5.0") and February the driest (3.2").