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Onset, MA
Full City Profile · Massachusetts · Plymouth County County
2.0
/5.0
C
Fair
1,561
Population
1,445/sq mi density
$415,500
Home Value
$641,084 Zillow
51°F
Avg Temperature
271 sunny days/yr
313
Violent Crime/100K
1,562 property/100K
C
Overall
2.0 / 5.0
Fair overall score based on economy, affordability, safety and education
F
Safety
1.0 / 5.0
313 violent crimes/100K
B
Education
3.0 / 5.0
25.0% bachelor's degree or higher
Onset experiences four distinct seasons with an average annual temperature of 51°F (11°C). Winters average 30°F in January while summers reach 73°F in July. The area gets 271 sunny days per year. Annual precipitation totals 51.1 inches. The area receives 37.2 inches of snow annually. Air quality is rated Good with a median AQI of 37.
Temperature
30°F Jan (-1°C)
73°F Jul (23°C)
| Annual Average | 50.7°F |
| 6% below US avg | |
| January Average | 30°F (-1°C) |
| July Average | 73°F (23°C) |
| Sunny Days | 271 days/yr |
Geography
| Elevation | 5 ft (2 m) |
| Area | 1.3 sq mi (3.3 km²) |
| Population Density | 1,445/sq mi |
| Coordinates | 41.7460°N, 70.6683°W |
| Timezone | America/New_York |
| County | Plymouth County County |
| Nearest Airport | New Bedford Regional (EWB) 16 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 37.0 |
| Rating | Good |
Air Pollutants (EPA 2023)
| Ozone (O₃) | 0.0439 ppm |
| PM2.5 (Fine Particles) | 6.9 μg/m³ |
Natural Hazard Risk
| Overall Risk | Relatively Moderate |
| Risk Score | 90.4 / 100 |
| Social Vulnerability | 12.8 / 100 |
| Community Resilience | 98.6 / 100 |
Hazard Breakdown
| Tornado | Relatively Low |
| Hurricane | Relatively Moderate |
| Earthquake | Relatively Low |
| Wildfire | Very Low |
| Flood | Relatively Moderate |
| Hail | Very Low |
| Strong Wind | Relatively High |
| Heat Wave | Relatively Moderate |
| Winter Weather | Relatively Low |
| Lightning | Relatively High |
| Ice Storm | Relatively High |
| Drought | Relatively Moderate |
| Cold Wave | Relatively Low |
| Landslide | Very Low |
| Coastal Flood | Very High |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 30°F (-1°C) | 4.3 in | |
| February | 30°F (-1°C) | 3.9 in | Coldest |
| March | 38°F (3°C) | 4.4 in | |
| April | 46°F (8°C) | 4.3 in | |
| May | 57°F (14°C) | 3.7 in | |
| June | 66°F (19°C) | 3.6 in | |
| July | 73°F (23°C) | 3.3 in | Warmest, Driest |
| August | 70°F (21°C) | 4.1 in | |
| September | 63°F (17°C) | 4.1 in | |
| October | 53°F (11°C) | 4.0 in | |
| November | 44°F (7°C) | 4.7 in | Wettest |
| December | 34°F (1°C) | 4.6 in |
Onset has a seasonal temperature swing of 42°F / from 30°F in February to 73°F in July. Total annual precipitation is 48.9 inches, with November being the wettest month (4.7") and July the driest (3.3").