Fairfield is a city of approximately 7,100 people in New Jersey, United States. Located in the Eastern Time Zone at 40.9°N latitude.
In 2025, Fairfield recorded an average annual temperature of 54°F — about 1.7°F below the 30-year normal of 55°F. The hottest day reached 101°F in June; the coldest was 4°F in January. Total precipitation was 41 inches (drier than usual). The wettest month was May.
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