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Derby, CT
Full City Profile · Connecticut · Greater Bridgeport Planning Region County
3.4
/5.0
B
Good
12,359
Population
2,442/sq mi density
$76,263
Median Income
$45,781 per capita
$242,300
Home Value
$332,106 Zillow
$1,453
Median Rent
36.8% income on rent
50°F
Avg Temperature
271 sunny days/yr
192
Violent Crime/100K
1,925 property/100K
B
Overall
3.4 / 5.0
Good overall score based on economy, affordability, safety and education
A
Economy
4.2 / 5.0
$76,263 median income, 4.4% unemployment
A+
Affordability
4.9 / 5.0
$242,300 home value, $1,453/mo rent
F
Safety
1.0 / 5.0
192 violent crimes/100K
B+
Education
3.7 / 5.0
33.2% bachelor's degree or higher
Derby experiences four distinct seasons with an average annual temperature of 50°F (10°C). Winters average 27°F in January while summers reach 73°F in July. The area gets 271 sunny days per year. Annual precipitation totals 52.0 inches. Air quality is rated Good with a median AQI of 39.
Temperature
27°F Jan (-3°C)
73°F Jul (23°C)
| Annual Average | 50.2°F |
| 7% below US avg | |
| January Average | 27°F (-3°C) |
| July Average | 73°F (23°C) |
| Sunny Days | 271 days/yr |
Geography
| Elevation | 8 ft (2 m) |
| Area | 5.1 sq mi (13.1 km²) |
| Population Density | 2,442/sq mi |
| Coordinates | 41.3261°N, 73.0826°W |
| Timezone | America/New_York |
| County | Greater Bridgeport Planning Region County |
| Nearest Airport | Hudson Valley Regional (POU) 46 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 39.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Relatively Moderate |
| Risk Score | 91.8 / 100 |
| Social Vulnerability | 45.3 / 100 |
| Community Resilience | 59.9 / 100 |
Hazard Breakdown
| Tornado | Relatively Low |
| Hurricane | Relatively High |
| Earthquake | Relatively Low |
| Wildfire | Very Low |
| Flood | Relatively High |
| Hail | Very Low |
| Strong Wind | Relatively High |
| Heat Wave | Relatively Low |
| Winter Weather | Relatively High |
| Lightning | Relatively Moderate |
| Ice Storm | Relatively High |
| Drought | Very Low |
| Cold Wave | Relatively Low |
| Landslide | Very Low |
| Coastal Flood | Very High |
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 | — | 59 km |
Source: NOAA/NCEI Historical Tsunami Database. Sorted by wave height.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 27°F (-3°C) | 3.8 in | Coldest |
| February | 31°F (-1°C) | 3.4 in | Driest |
| March | 39°F (4°C) | 4.2 in | |
| April | 49°F (9°C) | 4.3 in | Wettest |
| May | 59°F (15°C) | 4.3 in | |
| June | 68°F (20°C) | 3.8 in | |
| July | 73°F (23°C) | 3.7 in | Warmest |
| August | 72°F (22°C) | 3.8 in | |
| September | 64°F (18°C) | 3.8 in | |
| October | 53°F (12°C) | 3.8 in | |
| November | 44°F (7°C) | 4.3 in | |
| December | 34°F (1°C) | 4.1 in |
Derby has a seasonal temperature swing of 45°F / from 27°F in January to 73°F in July. Total annual precipitation is 47.0 inches, with April being the wettest month (4.3") and February the driest (3.4").