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Wellesley, MA
Full City Profile · Massachusetts · Norfolk County County
3.6
/5.0
B+
Good
29,906
Population
2,985/sq mi density
$250,001
Median Income
$113,079 per capita
$1,513,400
Home Value
$1,976,477 Zillow
$2,849
Median Rent
24.1% income on rent
49°F
Avg Temperature
246 sunny days/yr
24
Violent Crime/100K
405 property/100K
B+
Overall
3.6 / 5.0
Good overall score based on economy, affordability, safety and education
A+
Economy
5.0 / 5.0
$250,001 median income, 2.0% unemployment
B
Affordability
3.3 / 5.0
$1,513,400 home value, $2,849/mo rent
F
Safety
1.0 / 5.0
24 violent crimes/100K
A+
Education
5.0 / 5.0
87.1% bachelor's degree or higher
Wellesley experiences four distinct seasons with an average annual temperature of 49°F (9°C). Winters average 26°F in January while summers reach 72°F in July. The area gets 246 sunny days per year. Annual precipitation totals 47.3 inches. The area receives 45.7 inches of snow annually. Air quality is rated Good with a median AQI of 37.
Temperature
26°F Jan (-3°C)
72°F Jul (22°C)
| Annual Average | 48.9°F |
| 9% below US avg | |
| January Average | 26°F (-3°C) |
| July Average | 72°F (22°C) |
| Sunny Days | 246 days/yr |
Geography
| Elevation | 138 ft (42 m) |
| Area | 10.0 sq mi (26.0 km²) |
| Population Density | 2,985/sq mi |
| Coordinates | 42.3059°N, 71.2829°W |
| Timezone | America/New_York |
| County | Norfolk County County |
| Nearest Airport | General Edward Lawrence Logan International (BOS) 15 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 37.0 |
| Rating | Good |
Air Pollutants (EPA 2023)
| Ozone (O₃) | 0.0445 ppm |
| NO₂ (Nitrogen Dioxide) | 7.0 ppb |
| PM2.5 (Fine Particles) | 6.5 μg/m³ |
Natural Hazard Risk
| Overall Risk | Relatively Moderate |
| Risk Score | 92.0 / 100 |
| Social Vulnerability | 12.8 / 100 |
| Community Resilience | 93.0 / 100 |
Hazard Breakdown
| Tornado | Relatively Moderate |
| Hurricane | Relatively Moderate |
| Earthquake | Relatively Moderate |
| Wildfire | Very Low |
| Flood | Relatively High |
| Hail | Very Low |
| Strong Wind | Relatively Moderate |
| Heat Wave | Relatively Moderate |
| Winter Weather | Relatively Low |
| Lightning | Relatively High |
| Ice Storm | Relatively High |
| Drought | Relatively Low |
| Cold Wave | Relatively Moderate |
| Landslide | Relatively Low |
| Coastal Flood | Relatively High |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 26°F (-3°C) | 4.0 in | Coldest |
| February | 28°F (-2°C) | 3.5 in | Driest |
| March | 36°F (2°C) | 4.1 in | |
| April | 46°F (8°C) | 3.9 in | |
| May | 57°F (14°C) | 3.5 in | |
| June | 65°F (19°C) | 3.5 in | |
| July | 72°F (22°C) | 3.5 in | Warmest |
| August | 71°F (22°C) | 3.9 in | |
| September | 63°F (17°C) | 3.6 in | |
| October | 52°F (11°C) | 3.9 in | |
| November | 43°F (6°C) | 4.4 in | Wettest |
| December | 32°F (-0°C) | 4.2 in |
Wellesley has a seasonal temperature swing of 45°F / from 26°F in January to 72°F in July. Total annual precipitation is 46.1 inches, with November being the wettest month (4.4") and February the driest (3.5").