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Weather & Climate in Hackettstown, NJ
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Hackettstown experiences four distinct seasons with an average annual temperature of 53°F (11°C). Winters average 30°F in January while summers reach 75°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 45.5 inches. Air quality is rated Good with a median AQI of 39. The city sits at an elevation of 539 feet.
Temperature
30°F Jan (-1°C)
75°F Jul (24°C)
| Annual Average | 52.5°F |
| 3% below US avg | |
| January Average | 30°F (-1°C) |
| July Average | 75°F (24°C) |
| Sunny Days | 275 days/yr |
Geography
| Elevation | 539 ft (164 m) |
| Area | 1.4 sq mi (3.7 km²) |
| Population Density | 2,810/sq mi |
| Coordinates | 40.8537°N, 74.8249°W |
| Timezone | America/New_York |
| County | Morris County County |
| Nearest Airport | Central Jersey Regional (JVI) 26 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 39.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Relatively Moderate |
| Risk Score | 92.9 / 100 |
| Social Vulnerability | 10.6 / 100 |
| Community Resilience | 89.5 / 100 |
Hazard Breakdown
| Tornado | Relatively Moderate |
| Hurricane | Relatively Moderate |
| Earthquake | Relatively Low |
| Wildfire | Very Low |
| Flood | Relatively High |
| Hail | Very Low |
| Strong Wind | Relatively High |
| Heat Wave | Relatively Moderate |
| Winter Weather | Very High |
| Lightning | Relatively High |
| Ice Storm | Relatively Low |
| Drought | Relatively Moderate |
| Cold Wave | Relatively High |
| Landslide | Relatively Low |
| Avalanche | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Earthquake History
31 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M4.8.
| Apr 5, 2024 | 2024 Tewksbury, New Jersey Earthquake | M4.8 | 18 km | 3 km |
| Jan 16, 1994 | 2 km W of Sinking Spring, Pennsylvania | M4.6 | 118 km | 5 km |
| Jan 16, 1994 | 0 km E of Sinking Spring, Pennsylvania | M4.2 | 116 km | 5 km |
| Apr 5, 2024 | 7 km WSW of Gladstone, New Jersey | M3.7 | 19 km | 4 km |
| Jan 9, 1992 | 4 km WNW of Robertsville, New Jersey | M3.1 | 68 km | 8 km |
| Aug 26, 2003 | 4 km NNW of Milford, New Jersey | M3.1 | 36 km | 3 km |
| Nov 14, 1997 | 0 km S of Rothsville, Pennsylvania | M3.0 | 144 km | 5 km |
| Aug 3, 2025 | 0 km W of Little Ferry, New Jersey | M3.0 | 65 km | 10 km |
| Oct 28, 1991 | 3 km WNW of Stamford, Connecticut | M3.0 | 107 km | 10 km |
| Feb 3, 2009 | 1 km ESE of Victory Gardens, New Jersey | M3.0 | 25 km | 0 km |
| Jan 16, 1994 | 0 km SSE of Sinking Spring, Pennsylvania | M2.9 | 116 km | 5 km |
| Apr 27, 2024 | 7 km WSW of Gladstone, New Jersey | M2.9 | 19 km | 5 km |
| May 24, 2024 | 6 km E of Califon, New Jersey | M2.9 | 17 km | 7 km |
| May 10, 1993 | 1 km NW of Whitfield, Pennsylvania | M2.8 | 115 km | 5 km |
| Aug 5, 2025 | 1 km N of Hillsdale, New Jersey | M2.8 | 69 km | 12 km |
| Jul 1, 2009 | 3 km ESE of Pennsville, New Jersey | M2.8 | 146 km | 5 km |
| Apr 12, 1991 | 2 km ENE of North Castle, New York | M2.7 | 104 km | 9 km |
| Jan 25, 2015 | 4 km ESE of Downingtown, Pennsylvania | M2.6 | 118 km | 2 km |
| Jul 5, 1996 | 2 km NW of Chester Heights, Pennsylvania | M2.6 | 120 km | 18 km |
| Apr 5, 2024 | 6 km ESE of Califon, New Jersey | M2.6 | 19 km | 6 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Hurricane History
2 hurricanes (Category 1+) recorded within 500 km since 1980. Strongest on record: Category 2.
| Year | Name | Category | Max Wind | Closest |
| 1991 | Bob | Category 2 | 109 mph | 230 km |
| 1985 | Gloria | Category 2 | 98 mph | 132 km |
Source: NOAA IBTrACS (Category 1+, 1980–2026).
Tornado History
284 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF3. Total: 16 fatalities, 194 injuries.
| Date | Rating | Distance | Path | Fatalities |
| Jul 29, 2021 | EF3 | 82 km | 3.4 mi | 0 |
| May 31, 1998 | EF3 | 55 km | 20.0 mi | 0 |
| May 31, 1998 | EF3 | 100 km | 8.3 mi | 0 |
| Jul 27, 1994 | EF3 | 91 km | 2.0 mi | 3 |
| Oct 18, 1990 | EF3 | 42 km | 0.5 mi | 0 |
| Jul 14, 1988 | EF3 | 58 km | 7.2 mi | 0 |
| Jul 26, 1981 | EF3 | 64 km | 3.3 mi | 0 |
| Sep 26, 1977 | EF3 | 60 km | 5.9 mi | 0 |
| Mar 21, 1976 | EF3 | 33 km | 0.5 mi | 0 |
| May 28, 1973 | EF3 | 9 km | 0.4 mi | 0 |
| May 28, 1973 | EF3 | 28 km | 0.4 mi | 0 |
| Jun 24, 1960 | EF3 | 65 km | 12.9 mi | 0 |
| Apr 1, 2023 | EF2 | 91 km | 1.6 mi | 0 |
| Apr 1, 2023 | EF2 | 86 km | 2.1 mi | 0 |
| Feb 21, 2023 | EF2 | 65 km | 5.8 mi | 0 |
| Sep 1, 2021 | EF2 | 90 km | 8.3 mi | 1 |
| Jul 29, 2021 | EF2 | 58 km | 6.3 mi | 0 |
| Aug 4, 2020 | EF2 | 87 km | 20.8 mi | 0 |
| Jun 13, 2018 | EF2 | 96 km | 2.9 mi | 0 |
| Feb 25, 2017 | EF2 | 90 km | 12.5 mi | 0 |
Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).
Tsunami History
3 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 | — | 145 km |
| 1895 | HIGH BRIDGE, NJ | Earthquake | — | — | 21 km |
| 1840 | PHILADELPHIA, PENNSYLVANIA | Earthquake | — | — | 121 km |
Source: NOAA/NCEI Historical Tsunami Database.
Wildfire History
20 wildfires (100+ acres) recorded within 100 km. Largest: UNNAMED (23,000 acres, 1985).
| Year | Name | Acres Burned | Distance |
| 1985 | UNNAMED | 23,000 | 70 km |
| 2016 | 16 MILE | 7,896 | 47 km |
| 2024 | JENNINGS CREEK | 5,069 | 57 km |
| 1992 | UNNAMED | 4,470 | 99 km |
| 2002 | UNNAMED | 2,824 | 98 km |
| 2015 | ROOSA GAP | 2,747 | 94 km |
| 2010 | FORT DIX RANGE 1-14 | 2,615 | 97 km |
| 2009 | PENOBSCOT | 2,091 | 95 km |
| 2004 | CRYSTAL LAKE | 1,838 | 91 km |
| 1995 | UNNAMED | 1,318 | 98 km |
| 1992 | UNNAMED | 959 | 96 km |
| 1986 | LAKEHURST NAVAL AIR | 906 | 100 km |
| 1995 | UNNAMED | 877 | 97 km |
| 1991 | UNNAMED | 860 | 99 km |
| 1988 | UNNAMED | 833 | 73 km |
| 2020 | SEVEN PINES | 790 | 54 km |
| 1985 | UNNAMED | 737 | 65 km |
| 2015 | RAZOR FIRE | 728 | 73 km |
| 2015 | PIPELINE 1 | 666 | 78 km |
| 2016 | BEAR TOWN | 649 | 49 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 30°F (-1°C) | 3.7 in | |
| February | 28°F (-3°C) | 3.2 in | Coldest, Driest |
| March | 36°F (2°C) | 3.9 in | |
| April | 47°F (8°C) | 4.3 in | |
| May | 57°F (14°C) | 4.7 in | |
| June | 66°F (19°C) | 4.4 in | |
| July | 75°F (24°C) | 4.7 in | Warmest, Wettest |
| August | 69°F (21°C) | 4.5 in | |
| September | 62°F (17°C) | 4.3 in | |
| October | 51°F (11°C) | 3.7 in | |
| November | 41°F (5°C) | 4.3 in | |
| December | 31°F (-1°C) | 3.7 in |
Hackettstown has a seasonal temperature swing of 47°F / from 28°F in February to 75°F in July. Total annual precipitation is 49.3 inches, with July being the wettest month (4.7") and February the driest (3.2").