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Groton, CT
Full City Profile · Connecticut · Southeastern Connecticut Planning Region County
3.2
/5.0
B
Good
9,343
Population
3,033/sq mi density
$69,811
Median Income
$42,438 per capita
$278,900
Home Value
$411,359 Zillow
$1,179
Median Rent
29.1% income on rent
51°F
Avg Temperature
275 sunny days/yr
178
Violent Crime/100K
1,104 property/100K
B
Overall
3.2 / 5.0
Good overall score based on economy, affordability, safety and education
B
Economy
3.4 / 5.0
$69,811 median income, 4.3% unemployment
A
Affordability
4.4 / 5.0
$278,900 home value, $1,179/mo rent
F
Safety
1.0 / 5.0
178 violent crimes/100K
B+
Education
3.8 / 5.0
34.7% bachelor's degree or higher
Groton experiences four distinct seasons with an average annual temperature of 51°F (11°C). Winters average 31°F in January while summers reach 72°F in July. The area gets 275 sunny days per year. Annual precipitation totals 39.3 inches. Air quality is rated Good with a median AQI of 39.
Temperature
31°F Jan (-1°C)
72°F Jul (22°C)
| Annual Average | 51.4°F |
| 5% below US avg | |
| January Average | 31°F (-1°C) |
| July Average | 72°F (22°C) |
| Sunny Days | 275 days/yr |
Geography
| Elevation | 34 ft (10 m) |
| Area | 3.1 sq mi (8.0 km²) |
| Population Density | 3,033/sq mi |
| Coordinates | 41.3251°N, 72.0669°W |
| Timezone | America/New_York |
| County | Southeastern Connecticut Planning Region County |
| Nearest Airport | Rhode Island Tf Green International (PVD) 43 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 39.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Relatively Moderate |
| Risk Score | 88.7 / 100 |
| Social Vulnerability | 26.8 / 100 |
| Community Resilience | 86.4 / 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 Moderate |
| Lightning | Relatively Moderate |
| Ice Storm | Relatively Moderate |
| Drought | Relatively Low |
| Cold Wave | Relatively Low |
| Landslide | Relatively Low |
| Coastal Flood | Relatively Moderate |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Tsunami History
1 tsunami recorded within 500 km. Highest wave on record: 0.3 m (1 ft).
| Year | Location | Cause | Max Wave | Deaths | Distance |
| 1964 | LONG ISLAND, NY | Meteorological | 0.3 m | — | 105 km |
Source: NOAA/NCEI Historical Tsunami Database. Sorted by wave height.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 31°F (-1°C) | 4.2 in | |
| February | 30°F (-1°C) | 3.6 in | Coldest |
| March | 38°F (3°C) | 4.4 in | |
| April | 47°F (8°C) | 4.3 in | |
| May | 56°F (14°C) | 3.8 in | |
| June | 65°F (19°C) | 3.6 in | |
| July | 72°F (22°C) | 3.3 in | Warmest, Driest |
| August | 71°F (22°C) | 4.1 in | |
| September | 64°F (18°C) | 3.9 in | |
| October | 54°F (12°C) | 3.9 in | |
| November | 45°F (7°C) | 4.6 in | Wettest |
| December | 35°F (2°C) | 4.3 in |
Groton has a seasonal temperature swing of 42°F / from 30°F in February to 72°F in July. Total annual precipitation is 47.9 inches, with November being the wettest month (4.6") and July the driest (3.3").