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Colchester, CT
Full City Profile · Connecticut · Southeastern Connecticut Planning Region County
3.5
/5.0
B+
Good
4,624
Population
1,034/sq mi density
$79,685
Median Income
$46,066 per capita
$280,500
Home Value
$416,774 Zillow
$1,444
Median Rent
29.5% income on rent
50°F
Avg Temperature
275 sunny days/yr
23
Violent Crime/100K
550 property/100K
B+
Overall
3.5 / 5.0
Good overall score based on economy, affordability, safety and education
A+
Economy
4.6 / 5.0
$79,685 median income, 1.9% unemployment
A+
Affordability
4.7 / 5.0
$280,500 home value, $1,444/mo rent
F
Safety
1.0 / 5.0
23 violent crimes/100K
B+
Education
3.8 / 5.0
34.4% bachelor's degree or higher
Colchester experiences four distinct seasons with an average annual temperature of 50°F (10°C). Winters average 27°F in January while summers reach 72°F in July. The area gets 275 sunny days per year. Annual precipitation totals 43.3 inches. Air quality is rated Good with a median AQI of 39.
Temperature
27°F Jan (-3°C)
72°F Jul (22°C)
| Annual Average | 49.9°F |
| 8% below US avg | |
| January Average | 27°F (-3°C) |
| July Average | 72°F (22°C) |
| Sunny Days | 275 days/yr |
Geography
| Elevation | 460 ft (140 m) |
| Area | 4.5 sq mi (11.6 km²) |
| Population Density | 1,034/sq mi |
| Coordinates | 41.5776°N, 72.3327°W |
| Timezone | America/New_York |
| County | Southeastern Connecticut Planning Region County |
| Nearest Airport | Bradley International (BDL) 31 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 | - | 108 km |
Source: NOAA/NCEI Historical Tsunami Database. Sorted by wave height.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 27°F (-3°C) | 4.3 in | Coldest |
| February | 27°F (-3°C) | 3.6 in | Driest |
| March | 36°F (2°C) | 4.4 in | |
| April | 46°F (8°C) | 4.4 in | |
| May | 56°F (13°C) | 4.1 in | |
| June | 65°F (18°C) | 3.9 in | |
| July | 72°F (22°C) | 3.9 in | Warmest |
| August | 70°F (21°C) | 4.1 in | |
| September | 62°F (17°C) | 4.1 in | |
| October | 52°F (11°C) | 4.3 in | |
| November | 43°F (6°C) | 4.7 in | Wettest |
| December | 32°F (0°C) | 4.4 in |
Colchester has a seasonal temperature swing of 45°F / from 27°F in January to 72°F in July. Total annual precipitation is 50.0 inches, with November being the wettest month (4.7") and February the driest (3.6").