Hackettstown is a city of approximately 9,600 people in New Jersey, United States. Located in the Eastern Time Zone at 40.9°N latitude.
In 2025, Hackettstown recorded an average annual temperature of 51°F — about 1.6°F below the 30-year normal of 53°F. The hottest day reached 95°F in June; the coldest was 1°F in January. Total precipitation was 44 inches (near normal). The wettest month was May.
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