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South Dennis, MA
Full City Profile · Massachusetts · Barnstable County County
3.3
/5.0
B
Good
3,190
Population
701/sq mi density
$86,500
Median Income
$48,122 per capita
$454,400
Home Value
$651,322 Zillow
$1,542
Median Rent
31.3% income on rent
50°F
Avg Temperature
275 sunny days/yr
469
Violent Crime/100K
2,565 property/100K
B
Overall
3.3 / 5.0
Good overall score based on economy, affordability, safety and education
A+
Economy
4.7 / 5.0
$86,500 median income, 2.1% unemployment
B+
Affordability
3.7 / 5.0
$454,400 home value, $1,542/mo rent
F
Safety
1.0 / 5.0
469 violent crimes/100K (23% above avg)
B+
Education
4.0 / 5.0
37.1% bachelor's degree or higher
South Dennis experiences four distinct seasons with an average annual temperature of 50°F (10°C). Winters average 31°F in January while summers reach 71°F in July. The area gets 275 sunny days per year. Annual precipitation totals 46.3 inches. Air quality is rated Good with a median AQI of 37.
Temperature
31°F Jan (-0°C)
71°F Jul (22°C)
| Annual Average | 50.4°F |
| 7% below US avg | |
| January Average | 31°F (-0°C) |
| July Average | 71°F (22°C) |
| Sunny Days | 275 days/yr |
Geography
| Elevation | 51 ft (16 m) |
| Area | 4.6 sq mi (11.8 km²) |
| Population Density | 701/sq mi |
| Coordinates | 41.7041°N, 70.1507°W |
| Timezone | America/New_York |
| County | Barnstable County County |
| Nearest Airport | New Bedford Regional (EWB) 42 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 37.0 |
| Rating | Good |
Air Pollutants (EPA 2023)
| Ozone (O₃) | 0.0435 ppm |
Natural Hazard Risk
| Overall Risk | Relatively Moderate |
| Risk Score | 89.1 / 100 |
| Social Vulnerability | 34.5 / 100 |
| Community Resilience | 99.3 / 100 |
Hazard Breakdown
| Tornado | Relatively Low |
| Hurricane | Relatively High |
| Earthquake | Relatively Low |
| Wildfire | Very Low |
| Flood | Relatively Moderate |
| Hail | Relatively Low |
| Strong Wind | Relatively Moderate |
| Heat Wave | Relatively Low |
| Winter Weather | Relatively Low |
| Lightning | Relatively High |
| Ice Storm | Relatively Low |
| Drought | Relatively Low |
| Cold Wave | Relatively Low |
| Landslide | Relatively Low |
| Coastal Flood | Very High |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 31°F (-0°C) | 3.7 in | Coldest |
| February | 31°F (-0°C) | 3.6 in | |
| March | 38°F (3°C) | 3.7 in | |
| April | 46°F (8°C) | 3.7 in | |
| May | 55°F (13°C) | 3.5 in | |
| June | 63°F (17°C) | 3.2 in | |
| July | 71°F (22°C) | 3.0 in | Warmest, Driest |
| August | 69°F (21°C) | 3.2 in | |
| September | 63°F (17°C) | 3.5 in | |
| October | 53°F (12°C) | 3.8 in | |
| November | 45°F (7°C) | 4.3 in | Wettest |
| December | 36°F (2°C) | 4.3 in |
South Dennis has a seasonal temperature swing of 40°F / from 31°F in January to 71°F in July. Total annual precipitation is 43.6 inches, with November being the wettest month (4.3") and July the driest (3.0").