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South Wilton, CT
Full City Profile · Connecticut · Western Connecticut Planning Region County
3.7
/5.0
B+
Good
1,453
Population
1,297/sq mi density
$157,446
Median Income
$108,946 per capita
$780,800
Home Value
$1,317,248 Zillow
50°F
Avg Temperature
275 sunny days/yr
19
Violent Crime/100K
317 property/100K
B+
Overall
3.7 / 5.0
Good overall score based on economy, affordability, safety and education
A+
Economy
5.0 / 5.0
$157,446 median income, 2.3% unemployment
B+
Affordability
3.9 / 5.0
$780,800 home value, /mo rent
F
Safety
1.0 / 5.0
19 violent crimes/100K
A+
Education
5.0 / 5.0
67.6% bachelor's degree or higher
South Wilton 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 48.0 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 | 49.6°F |
| 8% below US avg | |
| January Average | 27°F (-3°C) |
| July Average | 72°F (22°C) |
| Sunny Days | 275 days/yr |
Geography
| Elevation | 132 ft (40 m) |
| Area | 1.1 sq mi (2.9 km²) |
| Population Density | 1,297/sq mi |
| Coordinates | 41.1723°N, 73.4170°W |
| Timezone | America/New_York |
| County | Western Connecticut Planning Region County |
| Nearest Airport | Laguardia (LGA) 36 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 | — | 49 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 | 27°F (-3°C) | 3.9 in | Coldest |
| February | 29°F (-2°C) | 3.4 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) | 4.0 in | |
| July | 72°F (22°C) | 4.0 in | Warmest |
| August | 71°F (21°C) | 4.1 in | |
| September | 63°F (17°C) | 4.3 in | |
| October | 52°F (11°C) | 4.1 in | |
| November | 43°F (6°C) | 4.5 in | |
| December | 33°F (0°C) | 4.1 in |
South Wilton has a seasonal temperature swing of 45°F / from 27°F in January to 72°F in July. Total annual precipitation is 49.7 inches, with May being the wettest month (4.7") and February the driest (3.4").