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Weather & Climate in New Gretna, NJ
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
New Gretna experiences four distinct seasons with an average annual temperature of 55°F (13°C). Winters average 34°F in January while summers reach 76°F in July. The area gets 293 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 41.0 inches. The area receives 10.2 inches of snow annually. Air quality is rated Good with a median AQI of 39. The city sits at an elevation of 10 feet.
Temperature
34°F Jan (1°C)
76°F Jul (25°C)
| Annual Average | 54.9°F |
| 2% above US avg | |
| January Average | 34°F (1°C) |
| July Average | 76°F (25°C) |
| Sunny Days | 293 days/yr |
Geography
| Elevation | 10 ft (3 m) |
| Area | 0.9 sq mi (2.2 km²) |
| Population Density | 293/sq mi |
| Coordinates | 39.5878°N, 74.4545°W |
| Timezone | America/New_York |
| County | Atlantic County County |
| Nearest Airport | Atlantic City International (ACY) 11 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 39.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Relatively Moderate |
| Risk Score | 93.0 / 100 |
| Social Vulnerability | 46.5 / 100 |
| Community Resilience | 83.0 / 100 |
Hazard Breakdown
| Tornado | Relatively Low |
| Hurricane | Relatively High |
| Earthquake | Relatively Low |
| Wildfire | Relatively Moderate |
| Flood | Relatively Moderate |
| Hail | Relatively Low |
| Strong Wind | Very High |
| Heat Wave | Relatively Moderate |
| Winter Weather | Very High |
| Lightning | Relatively High |
| Ice Storm | Relatively Moderate |
| Drought | Relatively Moderate |
| Cold Wave | Relatively Moderate |
| Landslide | Very Low |
| Coastal Flood | Very High |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Earthquake History
18 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M4.8.
| Apr 5, 2024 | 2024 Tewksbury, New Jersey Earthquake | M4.8 | 126 km | 3 km |
| Apr 5, 2024 | 7 km WSW of Gladstone, New Jersey | M3.7 | 125 km | 4 km |
| Oct 23, 1990 | 3 km W of Hancocks Bridge, New Jersey | M3.2 | 91 km | 10 km |
| Jan 9, 1992 | 4 km WNW of Robertsville, New Jersey | M3.1 | 87 km | 8 km |
| Aug 26, 2003 | 4 km NNW of Milford, New Jersey | M3.1 | 126 km | 3 km |
| Aug 3, 2025 | 0 km W of Little Ferry, New Jersey | M3.0 | 145 km | 10 km |
| Feb 3, 2009 | 1 km ESE of Victory Gardens, New Jersey | M3.0 | 143 km | 0 km |
| Apr 27, 2024 | 7 km WSW of Gladstone, New Jersey | M2.9 | 125 km | 5 km |
| May 24, 2024 | 6 km E of Califon, New Jersey | M2.9 | 128 km | 7 km |
| Jul 1, 2009 | 3 km ESE of Pennsville, New Jersey | M2.8 | 88 km | 5 km |
| Jan 25, 2015 | 4 km ESE of Downingtown, Pennsylvania | M2.6 | 113 km | 2 km |
| Apr 5, 2024 | 6 km ESE of Califon, New Jersey | M2.6 | 125 km | 6 km |
| Apr 10, 2024 | 5 km WSW of Gladstone, New Jersey | M2.6 | 126 km | 9 km |
| May 1, 2024 | 1 km NW of Gladstone, New Jersey | M2.6 | 128 km | 5 km |
| Aug 14, 2015 | 3 km SE of Mendham, New Jersey | M2.6 | 130 km | 8 km |
| Jul 5, 1996 | 2 km NW of Chester Heights, Pennsylvania | M2.6 | 96 km | 18 km |
| Oct 27, 2001 | 1 km NNW of Manhattan, New York | M2.6 | 140 km | 5 km |
| Feb 26, 1993 | 2 km SW of Marlton, New Jersey | M2.5 | 53 km | 5 km |
Source: USGS Earthquake Catalog (M2.5+, 1990-2025). Sorted by magnitude.
Hurricane History
9 hurricanes (Category 1+) recorded within 500 km since 1980. Strongest on record: Category 3.
| Year | Name | Category | Max Wind | Closest |
| 2021 | Henri | Category 1 | 75 mph | 297 km |
| 2014 | Arthur | Category 1 | 81 mph | 221 km |
| 2012 | Sandy | Category 2 | 98 mph | 180 km |
| 2011 | Irene | Category 1 | 75 mph | 172 km |
| 2010 | Earl | Category 1 | 81 mph | 293 km |
| 1993 | Emily | Category 3 | 109 mph | 278 km |
| 1991 | Bob | Category 3 | 109 mph | 147 km |
| 1986 | Charley | Category 1 | 75 mph | 252 km |
| 1985 | Gloria | Category 2 | 98 mph | 86 km |
Source: NOAA IBTrACS (Category 1+, 1980-2026).
Tornado History
172 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF3. Total: 2 fatalities, 101 injuries.
| Date | Rating | Distance | Path | Fatalities |
| Sep 1, 2021 | EF3 | 69 km | 12.4 mi | 0 |
| Jul 29, 2021 | EF3 | 76 km | 3.4 mi | 0 |
| Jul 21, 1983 | EF3 | 18 km | 0.2 mi | 0 |
| Sep 26, 1977 | EF3 | 87 km | 5.9 mi | 0 |
| Apr 28, 1961 | EF3 | 96 km | 0.3 mi | 0 |
| Jun 24, 1960 | EF3 | 81 km | 12.9 mi | 0 |
| Apr 1, 2023 | EF2 | 65 km | 1.6 mi | 0 |
| Apr 1, 2023 | EF2 | 63 km | 2.1 mi | 0 |
| Apr 1, 2023 | EF2 | 69 km | 0.1 mi | 0 |
| Feb 21, 2023 | EF2 | 80 km | 5.8 mi | 0 |
| Sep 1, 2021 | EF2 | 88 km | 8.3 mi | 1 |
| Jul 29, 2021 | EF2 | 29 km | 4.2 mi | 0 |
| Jul 29, 2021 | EF2 | 94 km | 6.3 mi | 0 |
| Aug 4, 2020 | EF2 | 70 km | 20.8 mi | 0 |
| Oct 31, 2019 | EF2 | 98 km | 0.5 mi | 0 |
| Sep 28, 2004 | EF2 | 99 km | 5.0 mi | 0 |
| May 27, 2001 | EF2 | 85 km | 1.5 mi | 0 |
| Aug 20, 1999 | EF2 | 18 km | 0.4 mi | 0 |
| May 31, 1998 | EF2 | 77 km | 5.6 mi | 0 |
| Aug 21, 1993 | EF2 | 32 km | 1.5 mi | 0 |
Source: NOAA Storm Prediction Center (EF0+, 1950-2024, US only).
Tsunami History
2 tsunamis recorded within 500 km.
| Year | Location | Cause | Max Wave | Deaths | Distance |
| 1895 | HIGH BRIDGE, NJ | Earthquake | - | - | 125 km |
| 1840 | PHILADELPHIA, PENNSYLVANIA | Earthquake | - | - | 68 km |
Source: NOAA/NCEI Historical Tsunami Database.
Wildfire History
20 wildfires (100+ acres) recorded within 100 km. Largest: GREENWOOD STATE FOREST (21,271 acres, 1995).
| Year | Name | Acres Burned | Distance |
| 1995 | GREENWOOD STATE FOREST | 21,271 | 32 km |
| 2007 | WARREN GROVE | 15,315 | 16 km |
| 2022 | MULLICA RIVER FIRE | 13,082 | 22 km |
| 1999 | BASS RIVER | 12,129 | 9 km |
| 2019 | SPRING HILL FIRE | 8,182 | 23 km |
| 2023 | ALLEN ROAD | 6,213 | 7 km |
| 1992 | FORKED RIVER MOUTAIN APR | 5,093 | 34 km |
| 1992 | POWER PLANT | 4,928 | 33 km |
| 1992 | UNNAMED | 4,470 | 46 km |
| 2024 | TEA TIME HILL | 4,444 | 26 km |
| 2006 | UNNAMED | 3,780 | 21 km |
| 2017 | PENN SWAMP FIRE | 3,587 | 19 km |
| 2023 | JIMMYS WATER HOLE | 3,585 | 47 km |
| 1989 | SIMM PLACE | 3,262 | 22 km |
| 2002 | UNNAMED | 2,824 | 47 km |
| 2007 | ATSION | 2,705 | 27 km |
| 1992 | FOUR MILE COLONY | 2,647 | 32 km |
| 1996 | UNNAMED | 2,625 | 13 km |
| 2010 | FORT DIX RANGE 1-14 | 2,615 | 48 km |
| 1990 | UNNAMED | 2,367 | 34 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 34°F (1°C) | 3.7 in | Coldest |
| February | 34°F (1°C) | 3.1 in | |
| March | 42°F (5°C) | 4.3 in | |
| April | 51°F (10°C) | 3.9 in | |
| May | 60°F (16°C) | 3.5 in | |
| June | 69°F (21°C) | 3.1 in | Driest |
| July | 76°F (25°C) | 3.9 in | Warmest |
| August | 74°F (23°C) | 4.6 in | Wettest |
| September | 67°F (20°C) | 3.2 in | |
| October | 56°F (13°C) | 3.2 in | |
| November | 47°F (8°C) | 3.6 in | |
| December | 38°F (3°C) | 3.6 in |
New Gretna has a seasonal temperature swing of 42°F / from 34°F in January to 76°F in July. Total annual precipitation is 43.6 inches, with August being the wettest month (4.6") and June the driest (3.1").