Dennis, MA
Full City Profile · Massachusetts · Barnstable County County
3.4
/5.0
B
Good
1,903
Population
388/sq mi density
$127,292
Median Income
$80,139 per capita
$835,300
Home Value
$678,668 Zillow
$1,542
Median Rent
20.2% income on rent
52°F
Avg Temperature
236
Violent Crime/100K
786 property/100K
B
Overall
3.4 / 5.0
Good overall score based on economy, affordability, safety and education
A+
Economy
4.8 / 5.0
$127,292 median income, 3.1% unemployment
C+
Affordability
3.0 / 5.0
$835,300 home value, $1,542/mo rent
F
Safety
1.0 / 5.0
236 violent crimes/100K
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. Annual precipitation totals 44.7 inches. The area receives 21.5 inches of snow annually. Air quality is rated Good with a median AQI of 36.
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) |
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 | 36.0 |
| Rating | Good |
| Good Days % | 94.3% |
| Unhealthy Days | 1 |
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) | 3.9 in | Coldest |
| February | 33°F (0°C) | 3.2 in | |
| March | 38°F (3°C) | 4.3 in | |
| April | 47°F (8°C) | 3.9 in | |
| May | 57°F (14°C) | 3.4 in | |
| June | 66°F (19°C) | 3.1 in | |
| July | 73°F (23°C) | 2.7 in | Warmest, Driest |
| August | 72°F (22°C) | 3.3 in | |
| September | 64°F (18°C) | 3.9 in | |
| October | 55°F (13°C) | 4.3 in | |
| November | 45°F (7°C) | 4.1 in | |
| December | 37°F (3°C) | 4.7 in | Wettest |
Dennis has a seasonal temperature swing of 41°F / from 32°F in January to 73°F in July. Total annual precipitation is 44.7 inches, with December being the wettest month (4.7") and July the driest (2.7").