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Dennis, MA
Full City Profile · Massachusetts · Barnstable County County
3.5
/5.0
B+
Good
1,903
Population
388/sq mi density
$127,292
Median Income
$80,139 per capita
$835,300
Home Value
$651,322 Zillow
$1,542
Median Rent
20.2% income on rent
52°F
Avg Temperature
275 sunny days/yr
641
Violent Crime/100K
1,412 property/100K
B+
Overall
3.5 / 5.0
Good overall score based on economy, affordability, safety and education
A+
Economy
5.0 / 5.0
$127,292 median income, 1.5% unemployment
C+
Affordability
3.0 / 5.0
$835,300 home value, $1,542/mo rent
F
Safety
1.0 / 5.0
641 violent crimes/100K (69% above avg)
A+
Education
5.0 / 5.0
50.3% bachelor's degree or higher
Dennis experiences four distinct seasons with an average annual temperature of 52°F (11°C). Winters average 32°F in January while summers reach 73°F in July. The area gets 275 sunny days per year. Annual precipitation totals 44.7 inches. Air quality is rated Good with a median AQI of 37.
Temperature
32°F Jan (0°C)
73°F Jul (23°C)
| Annual Average | 51.5°F |
| 5% below US avg | |
| January Average | 32°F (0°C) |
| July Average | 73°F (23°C) |
| Sunny Days | 275 days/yr |
Geography
| Elevation | 5 ft (2 m) |
| Area | 5.1 sq mi (13.2 km²) |
| Population Density | 388/sq mi |
| Coordinates | 41.7302°N, 70.1974°W |
| Timezone | America/New_York |
| County | Barnstable County County |
| Nearest Airport | New Bedford Regional (EWB) 39 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 | 32°F (0°C) | 3.7 in | |
| February | 31°F (-0°C) | 3.6 in | Coldest |
| March | 38°F (3°C) | 3.7 in | |
| April | 46°F (8°C) | 3.8 in | |
| May | 55°F (13°C) | 3.5 in | |
| June | 64°F (18°C) | 3.2 in | |
| July | 73°F (23°C) | 3.0 in | Warmest, Driest |
| August | 70°F (21°C) | 3.4 in | |
| September | 63°F (17°C) | 3.5 in | |
| October | 53°F (12°C) | 3.7 in | |
| November | 45°F (7°C) | 4.4 in | Wettest |
| December | 36°F (2°C) | 4.3 in |
Dennis has a seasonal temperature swing of 42°F / from 31°F in February to 73°F in July. Total annual precipitation is 43.7 inches, with November being the wettest month (4.4") and July the driest (3.0").