All Countries
Cornwall, CT
Full City Profile · Connecticut · Northwest Hills Planning Region County
3.7
/5.0
B+
Good
65
Population
116/sq mi density
$134,167
Median Income
$155,657 per capita
48°F
Avg Temperature
275 sunny days/yr
124
Violent Crime/100K
1,775 property/100K
B+
Overall
3.7 / 5.0
Good overall score based on economy, affordability, safety and education
A+
Economy
5.0 / 5.0
$134,167 median income, 0.0% unemployment
F
Safety
1.0 / 5.0
124 violent crimes/100K
A+
Education
5.0 / 5.0
70.8% bachelor's degree or higher
Cornwall experiences four distinct seasons with an average annual temperature of 48°F (9°C). Winters average 25°F in January while summers reach 71°F in July. The area gets 275 sunny days per year. Annual precipitation totals 46.9 inches. Air quality is rated Good with a median AQI of 39.
Temperature
25°F Jan (-4°C)
71°F Jul (22°C)
| Annual Average | 48.4°F |
| 10% below US avg | |
| January Average | 25°F (-4°C) |
| July Average | 71°F (22°C) |
| Sunny Days | 275 days/yr |
Geography
| Elevation | 704 ft (215 m) |
| Area | 0.6 sq mi (1.5 km²) |
| Population Density | 116/sq mi |
| Coordinates | 41.8443°N, 73.3327°W |
| Timezone | America/New_York |
| County | Northwest Hills Planning Region County |
| Nearest Airport | Hudson Valley Regional (POU) 32 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 39.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Relatively Low |
| Risk Score | 79.6 / 100 |
| Social Vulnerability | 12.8 / 100 |
| Community Resilience | 76.7 / 100 |
Hazard Breakdown
| Tornado | Relatively Low |
| Hurricane | Relatively Moderate |
| Earthquake | Relatively Low |
| Wildfire | Very Low |
| Flood | Relatively Moderate |
| Hail | Relatively Low |
| Strong Wind | Relatively Low |
| Heat Wave | Very Low |
| Winter Weather | Relatively Low |
| Lightning | Relatively Low |
| Ice Storm | Relatively Moderate |
| Drought | Relatively Low |
| Cold Wave | Relatively Low |
| Landslide | Relatively Low |
| Avalanche | Very Low |
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 | — | 118 km |
Source: NOAA/NCEI Historical Tsunami Database. Sorted by wave height.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 25°F (-4°C) | 3.7 in | |
| February | 24°F (-5°C) | 3.4 in | Coldest, Driest |
| March | 33°F (0°C) | 3.9 in | |
| April | 44°F (7°C) | 4.1 in | |
| May | 55°F (13°C) | 4.5 in | Wettest |
| June | 63°F (17°C) | 4.2 in | |
| July | 71°F (22°C) | 4.2 in | Warmest |
| August | 67°F (19°C) | 4.3 in | |
| September | 59°F (15°C) | 4.1 in | |
| October | 48°F (9°C) | 3.9 in | |
| November | 38°F (3°C) | 4.4 in | |
| December | 27°F (-3°C) | 4.1 in |
Cornwall has a seasonal temperature swing of 48°F / from 24°F in February to 71°F in July. Total annual precipitation is 48.7 inches, with May being the wettest month (4.5") and February the driest (3.4").