With a population of around 7,400, Dunellen sits in New Jersey, United States. The city operates in the Eastern Time Zone.
In 2025, Dunellen recorded an average annual temperature of 54°F — about 1.4°F above the 30-year normal of 53°F. The hottest day reached 103°F in June; the coldest was 3°F in January. Total precipitation was 41 inches (drier than usual). The wettest month was May.
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