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Mamanasco Lake, CT
Full City Profile · Connecticut · Western Connecticut Planning Region County
4.4
/5.0
A
Great
462
Population
1,127/sq mi density
$243,750
Median Income
$193,046 per capita
$856,600
Home Value
$953,119 Zillow
48°F
Avg Temperature
271 sunny days/yr
4
Violent Crime/100K
257 property/100K
A
Overall
4.4 / 5.0
Strong
A+
Economy
5.0 / 5.0
$243,750 median income, 1.1% unemployment
A+
Affordability
4.7 / 5.0
$856,600 home value, /mo rent
C+
Safety
2.8 / 5.0
4 violent crimes/100K
A+
Education
5.0 / 5.0
76.6% bachelor's degree or higher
Mamanasco Lake experiences four distinct seasons with an average annual temperature of 48°F (9°C). Winters average 25°F in January while summers reach 70°F in July. The area gets 271 sunny days per year. Annual precipitation totals 50.4 inches. Air quality is rated Good with a median AQI of 39.
Temperature
25°F Jan (-4°C)
70°F Jul (21°C)
| Annual Average | 48.0°F |
| 11% below US avg | |
| January Average | 25°F (-4°C) |
| July Average | 70°F (21°C) |
| Sunny Days | 271 days/yr |
Geography
| Elevation | 638 ft (194 m) |
| Area | 0.4 sq mi (1.1 km²) |
| Population Density | 1,127/sq mi |
| Coordinates | 41.3182°N, 73.5298°W |
| Timezone | America/New_York |
| County | Western Connecticut Planning Region County |
| Nearest Airport | Hudson Valley Regional (POU) 28 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 39.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Relatively High |
| Risk Score | 96.3 / 100 |
| Social Vulnerability | 21.4 / 100 |
| Community Resilience | 62.3 / 100 |
Hazard Breakdown
| Tornado | Relatively Moderate |
| Hurricane | Relatively High |
| Earthquake | Relatively Moderate |
| Wildfire | Very Low |
| Flood | Relatively High |
| Hail | Relatively Low |
| Strong Wind | Relatively High |
| Heat Wave | Relatively Moderate |
| Winter Weather | Relatively High |
| Lightning | Relatively Moderate |
| Ice Storm | Relatively High |
| Drought | Relatively Low |
| Cold Wave | Relatively Moderate |
| Landslide | Relatively Moderate |
| Coastal Flood | Relatively High |
| Avalanche | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Tsunami History
2 tsunamis 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 | — | 68 km |
| 1895 | HIGH BRIDGE, NJ | Earthquake | — | — | 135 km |
Source: NOAA/NCEI Historical Tsunami Database. Sorted by wave height.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 25°F (-4°C) | 3.9 in | Coldest |
| February | 29°F (-2°C) | 3.3 in | Driest |
| March | 38°F (3°C) | 4.3 in | |
| April | 48°F (9°C) | 4.5 in | |
| May | 58°F (15°C) | 4.7 in | Wettest |
| June | 67°F (19°C) | 4.1 in | |
| July | 70°F (21°C) | 4.2 in | |
| August | 71°F (21°C) | 4.2 in | Warmest |
| September | 63°F (17°C) | 4.5 in | |
| October | 52°F (11°C) | 4.1 in | |
| November | 43°F (6°C) | 4.5 in | |
| December | 32°F (0°C) | 4.0 in |
Mamanasco Lake has a seasonal temperature swing of 46°F / from 25°F in January to 71°F in August. Total annual precipitation is 50.2 inches, with May being the wettest month (4.7") and February the driest (3.3").