Old Greenwich, CT
Full City Profile · Connecticut · Westchester County County
4.2
/5.0
A
Great
6,904
Population
3,452/sq mi density
$250,001
Median Income
$129,489 per capita
$1,668,200
Home Value
$2,195,451 Zillow
$3,501
Median Rent
25.9% income on rent
52°F
Avg Temperature
A
Overall
4.2 / 5.0
Strong
A+
Economy
4.6 / 5.0
$250,001 median income, 4.7% unemployment
C+
Affordability
2.9 / 5.0
$1,668,200 home value, $3,501/mo rent
A+
Education
5.0 / 5.0
84.3% bachelor's degree or higher
Old Greenwich experiences four distinct seasons with an average annual temperature of 52°F (11°C). Winters average 30°F in January while summers reach 74°F in July. Annual precipitation totals 47.8 inches. The area receives 34.0 inches of snow annually.
Temperature
30°F Jan (-1°C)
74°F Jul (23°C)
| Annual Average | 52.0°F |
| 4% below US avg | |
| January Average | 30°F (-1°C) |
| July Average | 74°F (23°C) |
Geography
| Elevation | 7 ft (2 m) |
| Area | 3.5 sq mi (9.0 km²) |
| Population Density | 3,452/sq mi |
| Coordinates | 41.0201°N, 73.5677°W |
| Timezone | America/New_York |
| County | Westchester County County |
| Nearest Airport | Laguardia (LGA) 23 miles away |
Precipitation & Snow
Air Quality
Air Pollutants (EPA 2023)
| Ozone (O₃) | 0.0418 ppm |
Natural Hazard Risk
| Overall Risk | Relatively High |
| Risk Score | 96.2 / 100 |
| Social Vulnerability | 47.4 / 100 |
| Community Resilience | 77.1 / 100 |
Hazard Breakdown
| Tornado | Relatively Moderate |
| Hurricane | Relatively High |
| Earthquake | Relatively Moderate |
| Wildfire | Very Low |
| Flood | Relatively High |
| Hail | Very Low |
| Strong Wind | Very High |
| Heat Wave | Relatively Moderate |
| Winter Weather | Very High |
| Lightning | Very High |
| Ice Storm | Relatively High |
| Drought | Very Low |
| Cold Wave | Relatively High |
| Landslide | Relatively Moderate |
| Coastal Flood | Relatively Moderate |
| 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 | - | 46 km |
| 1895 | HIGH BRIDGE, NJ | Earthquake | - | - | 117 km |
Source: NOAA/NCEI Historical Tsunami Database. Sorted by wave height.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 30°F (-1°C) | 3.2 in | Coldest |
| February | 32°F (-0°C) | 2.5 in | Driest |
| March | 39°F (4°C) | 4.1 in | |
| April | 50°F (10°C) | 4.2 in | |
| May | 60°F (15°C) | 3.9 in | |
| June | 69°F (20°C) | 4.3 in | |
| July | 74°F (23°C) | 4.1 in | Warmest |
| August | 72°F (22°C) | 4.4 in | |
| September | 65°F (19°C) | 4.9 in | Wettest |
| October | 54°F (12°C) | 4.3 in | |
| November | 44°F (7°C) | 3.6 in | |
| December | 35°F (2°C) | 4.2 in |
Old Greenwich has a seasonal temperature swing of 44°F / from 30°F in January to 74°F in July. Total annual precipitation is 47.8 inches, with September being the wettest month (4.9") and February the driest (2.5").