Old Greenwich is a city of approximately 6,600 people in Connecticut, United States. Located in the Eastern Time Zone at 41°N latitude.
In 2025, Old Greenwich recorded an average annual temperature of 53°F — right at the 30-year normal of 54°F. The hottest day reached 103°F in June; the coldest was 3°F in January. Total precipitation was 47 inches (wetter than usual). The wettest month was May.
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