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Weather & Climate in Port Jefferson, OH
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Port Jefferson experiences four distinct seasons with an average annual temperature of 51°F (11°C). Winters average 26°F in January while summers reach 73°F in July. The area gets 275 sunny days per year, well above the U.S. average of 205 / making it one of the sunnier locations in the country. Annual precipitation totals 41.7 inches. Air quality is rated Good with a median AQI of 43. The city sits at an elevation of 970 feet.
Temperature
26°F Jan (-3°C)
73°F Jul (23°C)
| Annual Average | 50.9°F |
| 6% below US avg | |
| January Average | 26°F (-3°C) |
| July Average | 73°F (23°C) |
| Sunny Days | 275 days/yr |
Geography
| Elevation | 970 ft (296 m) |
| Area | 0.2 sq mi (0.4 km²) |
| Population Density | 2,407/sq mi |
| Coordinates | 40.3306°N, 84.0925°W |
| Timezone | America/New_York |
| County | Shelby County County |
| Nearest Airport | James M Cox Dayton International (DAY) 30 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 43.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Relatively Low |
| Risk Score | 56.2 / 100 |
| Social Vulnerability | 51.4 / 100 |
| Community Resilience | 91.9 / 100 |
Hazard Breakdown
| Tornado | Relatively Moderate |
| Hurricane | Very Low |
| Earthquake | Relatively Low |
| Wildfire | Very Low |
| Flood | Relatively Low |
| Hail | Relatively Moderate |
| Strong Wind | Relatively Moderate |
| Heat Wave | Very Low |
| Winter Weather | Relatively Moderate |
| Lightning | Relatively Moderate |
| Ice Storm | Relatively Moderate |
| Drought | Very Low |
| Cold Wave | Relatively Low |
| Landslide | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Earthquake History
10 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M3.6.
| Feb 19, 1995 | 8 km SSE of Rocky Fork Point, Ohio | M3.6 | 145 km | 10 km |
| Apr 17, 1990 | 8 km NW of Fort Recovery, Ohio | M3.0 | 66 km | 5 km |
| Apr 4, 1994 | 2 km WNW of Minster, Ohio | M2.9 | 27 km | 5 km |
| May 12, 2006 | 2 km E of Lima, Ohio | M2.8 | 46 km | 5 km |
| May 14, 2010 | 1 km ENE of Gibsonburg, Ohio | M2.7 | 135 km | 5 km |
| Jun 12, 2015 | 6 km NW of Convoy, Ohio | M2.6 | 90 km | 5 km |
| May 20, 2023 | 3 km SSE of Walbridge, Ohio | M2.6 | 145 km | 6 km |
| Jan 30, 2004 | 2 km S of Rockford, Ohio | M2.5 | 60 km | 5 km |
| Jun 4, 1990 | 4 km SSE of Van Buren, Ohio | M2.5 | 94 km | 5 km |
| Mar 18, 2024 | 4 km WSW of Millbury, Ohio | M2.5 | 145 km | 6 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Tornado History
485 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF5. Total: 67 fatalities, 2,006 injuries.
| Date | Rating | Distance | Path | Fatalities |
| Apr 3, 1974 | EF5 | 78 km | 31.3 mi | 36 |
| May 27, 2019 | EF4 | 65 km | 18.2 mi | 0 |
| Nov 10, 2002 | EF4 | 76 km | 52.8 mi | 4 |
| Sep 20, 2000 | EF4 | 76 km | 9.0 mi | 1 |
| Feb 18, 1992 | EF4 | 60 km | 2.8 mi | 0 |
| Apr 11, 1965 | EF4 | 25 km | 18.4 mi | 3 |
| Apr 11, 1965 | EF4 | 53 km | 32.5 mi | 13 |
| Mar 14, 2024 | EF3 | 89 km | 41.3 mi | 1 |
| Mar 14, 2024 | EF3 | 22 km | 31.3 mi | 3 |
| May 27, 2019 | EF3 | 51 km | 10.5 mi | 0 |
| May 27, 2019 | EF3 | 56 km | 10.8 mi | 1 |
| May 27, 2019 | EF3 | 63 km | 9.9 mi | 0 |
| May 14, 2014 | EF3 | 75 km | 8.9 mi | 0 |
| Nov 10, 2002 | EF3 | 80 km | 5.0 mi | 0 |
| Nov 10, 2002 | EF3 | 46 km | 9.0 mi | 0 |
| Oct 24, 2001 | EF3 | 61 km | 32.0 mi | 0 |
| Nov 22, 1992 | EF3 | 83 km | 20.0 mi | 0 |
| Mar 10, 1986 | EF3 | 83 km | 7.6 mi | 0 |
| Apr 3, 1974 | EF3 | 86 km | 8.7 mi | 0 |
| May 10, 1973 | EF3 | 25 km | 89.6 mi | 0 |
Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 26°F (-3°C) | 2.1 in | Coldest |
| February | 28°F (-2°C) | 2.0 in | Driest |
| March | 39°F (4°C) | 3.1 in | |
| April | 49°F (10°C) | 3.7 in | |
| May | 60°F (16°C) | 4.0 in | |
| June | 69°F (21°C) | 3.9 in | |
| July | 73°F (23°C) | 4.0 in | Warmest, Wettest |
| August | 71°F (22°C) | 3.4 in | |
| September | 64°F (18°C) | 2.7 in | |
| October | 53°F (12°C) | 2.6 in | |
| November | 42°F (5°C) | 3.1 in | |
| December | 31°F (-1°C) | 2.8 in |
Port Jefferson has a seasonal temperature swing of 47°F / from 26°F in January to 73°F in July. Total annual precipitation is 37.2 inches, with July being the wettest month (4.0") and February the driest (2.0").