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Groton, MA
Full City Profile · Massachusetts · Middlesex County County
2.8
/5.0
C+
Fair
1,571
Population
941/sq mi density
$736,800
Home Value
$758,473 Zillow
49°F
Avg Temperature
246 sunny days/yr
70
Violent Crime/100K
202 property/100K
C+
Overall
2.8 / 5.0
Fair overall score based on economy, affordability, safety and education
F
Safety
1.0 / 5.0
70 violent crimes/100K
A+
Education
4.6 / 5.0
44.8% bachelor's degree or higher
Groton experiences four distinct seasons with an average annual temperature of 49°F (9°C). Winters average 25°F in January while summers reach 72°F in July. The area gets 246 sunny days per year. Annual precipitation totals 43.4 inches. Air quality is rated Good with a median AQI of 37.
Temperature
25°F Jan (-4°C)
72°F Jul (22°C)
| Annual Average | 48.9°F |
| 9% below US avg | |
| January Average | 25°F (-4°C) |
| July Average | 72°F (22°C) |
| Sunny Days | 246 days/yr |
Geography
| Elevation | 311 ft (95 m) |
| Area | 1.7 sq mi (4.3 km²) |
| Population Density | 941/sq mi |
| Coordinates | 42.6116°N, 71.5647°W |
| Timezone | America/New_York |
| County | Middlesex County County |
| Nearest Airport | Manchester Boston Regional (MHT) 23 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 37.0 |
| Rating | Good |
Air Pollutants (EPA 2023)
| Ozone (O₃) | 0.0382 ppm |
| NO₂ (Nitrogen Dioxide) | 15.2 ppb |
| PM2.5 (Fine Particles) | 6.6 μg/m³ |
Natural Hazard Risk
| Overall Risk | Relatively High |
| Risk Score | 97.0 / 100 |
| Social Vulnerability | 15.8 / 100 |
| Community Resilience | 89.8 / 100 |
Hazard Breakdown
| Tornado | Relatively Moderate |
| Hurricane | Relatively High |
| Earthquake | Relatively Moderate |
| Wildfire | Relatively Low |
| Flood | Relatively High |
| Hail | Very Low |
| Strong Wind | Relatively High |
| Heat Wave | Relatively Moderate |
| Winter Weather | Relatively Moderate |
| Lightning | Relatively High |
| Ice Storm | Very High |
| Drought | Relatively Moderate |
| Cold Wave | Relatively High |
| Landslide | Very Low |
| Coastal Flood | Relatively Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 25°F (-4°C) | 3.7 in | Coldest |
| February | 25°F (-4°C) | 3.4 in | Driest |
| March | 34°F (1°C) | 3.9 in | |
| April | 45°F (7°C) | 3.9 in | |
| May | 56°F (13°C) | 3.7 in | |
| June | 64°F (18°C) | 3.7 in | |
| July | 72°F (22°C) | 3.7 in | Warmest |
| August | 69°F (21°C) | 3.8 in | |
| September | 61°F (16°C) | 3.5 in | |
| October | 50°F (10°C) | 3.9 in | |
| November | 41°F (5°C) | 4.5 in | Wettest |
| December | 29°F (-1°C) | 4.0 in |
Groton has a seasonal temperature swing of 48°F / from 25°F in January to 72°F in July. Total annual precipitation is 45.6 inches, with November being the wettest month (4.5") and February the driest (3.4").