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Port Jefferson, NY
Full City Profile · New York · Nassau County County
3.8
/5.0
B+
Good
8,029
Population
2,624/sq mi density
$143,125
Median Income
$74,865 per capita
$628,500
Home Value
$740,430 Zillow
$2,254
Median Rent
24.9% income on rent
55°F
Avg Temperature
275 sunny days/yr
22
Violent Crime/100K
356 property/100K
B+
Overall
3.8 / 5.0
Good overall score based on economy, affordability, safety and education
A+
Economy
5.0 / 5.0
$143,125 median income, 1.9% unemployment
A
Affordability
4.2 / 5.0
$628,500 home value, $2,254/mo rent
F
Safety
1.0 / 5.0
22 violent crimes/100K
A+
Education
5.0 / 5.0
69.0% bachelor's degree or higher
Port Jefferson experiences four distinct seasons with an average annual temperature of 55°F (13°C). Winters average 34°F in January while summers reach 75°F in July. The area gets 275 sunny days per year. Annual precipitation totals 48.5 inches. Air quality is rated Good with a median AQI of 36.
Temperature
34°F Jan (1°C)
75°F Jul (24°C)
| Annual Average | 54.7°F |
| 1% above US avg | |
| January Average | 34°F (1°C) |
| July Average | 75°F (24°C) |
| Sunny Days | 275 days/yr |
Geography
| Elevation | 230 ft (70 m) |
| Area | 3.1 sq mi (7.9 km²) |
| Population Density | 2,624/sq mi |
| Coordinates | 40.9422°N, 73.0528°W |
| Timezone | America/New_York |
| County | Nassau County County |
| Nearest Airport | John F Kennedy International (JFK) 43 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 36.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Relatively High |
| Risk Score | 97.1 / 100 |
| Social Vulnerability | 25.9 / 100 |
| Community Resilience | 97.0 / 100 |
Hazard Breakdown
| Tornado | Relatively Moderate |
| Hurricane | Relatively High |
| Earthquake | Relatively Moderate |
| Wildfire | Very Low |
| Flood | Relatively High |
| Hail | Very Low |
| Strong Wind | Relatively High |
| Heat Wave | Relatively Moderate |
| Winter Weather | Very High |
| Lightning | Very High |
| Ice Storm | Very High |
| Drought | Very Low |
| Cold Wave | Relatively High |
| Landslide | Relatively 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 | — | 16 km |
Source: NOAA/NCEI Historical Tsunami Database. Sorted by wave height.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 34°F (1°C) | 3.7 in | |
| February | 32°F (0°C) | 3.0 in | Coldest, Driest |
| March | 40°F (4°C) | 4.0 in | Wettest |
| April | 49°F (9°C) | 4.0 in | |
| May | 59°F (15°C) | 3.7 in | |
| June | 68°F (20°C) | 3.3 in | |
| July | 75°F (24°C) | 3.2 in | Warmest |
| August | 72°F (22°C) | 3.8 in | |
| September | 65°F (19°C) | 3.4 in | |
| October | 55°F (13°C) | 3.4 in | |
| November | 46°F (8°C) | 3.9 in | |
| December | 36°F (2°C) | 3.7 in |
Port Jefferson has a seasonal temperature swing of 43°F / from 32°F in February to 75°F in July. Total annual precipitation is 43.0 inches, with March being the wettest month (4.0") and February the driest (3.0").