Groton, CT
Full City Profile · Connecticut · Southeastern Connecticut Planning Region County
3.1
/5.0
B
Good
9,343
Population
3,033/sq mi density
$69,811
Median Income
$42,438 per capita
$278,900
Home Value
$447,813 Zillow
$1,179
Median Rent
29.1% income on rent
51°F
Avg Temperature
215
Violent Crime/100K
743 property/100K
B
Overall
3.1 / 5.0
Good overall score based on economy, affordability, safety and education
B
Economy
3.1 / 5.0
$69,811 median income, 6.4% unemployment
A
Affordability
4.4 / 5.0
$278,900 home value, $1,179/mo rent
F
Safety
1.0 / 5.0
215 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. Annual precipitation totals 39.3 inches. The area receives 24.5 inches of snow annually.
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) |
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
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) | 2.7 in | Coldest |
| February | 32°F (0°C) | 2.2 in | Driest |
| March | 39°F (4°C) | 3.8 in | |
| April | 48°F (9°C) | 3.6 in | |
| May | 57°F (14°C) | 3.3 in | |
| June | 66°F (19°C) | 3.3 in | |
| July | 72°F (22°C) | 3.2 in | Warmest |
| August | 72°F (22°C) | 3.3 in | |
| September | 65°F (18°C) | 3.8 in | Wettest |
| October | 54°F (12°C) | 3.7 in | |
| November | 45°F (7°C) | 3.2 in | |
| December | 37°F (3°C) | 3.1 in |
Groton has a seasonal temperature swing of 42°F / from 31°F in January to 72°F in July. Total annual precipitation is 39.3 inches, with September being the wettest month (3.8") and February the driest (2.2").