With a population of around 6,000, Old Tappan sits in New Jersey, United States. The city operates in the Eastern Time Zone.
In 2025, Old Tappan recorded an average annual temperature of 53°F — about 2.3°F below the 30-year normal of 55°F. The hottest day reached 101°F in June; the coldest was 2°F in January. Total precipitation was 42 inches (drier than usual). The wettest month was May.
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