Mendon, in Massachusetts, United States, is home to roughly 5,400 people in the Eastern Time Zone at 42.1°N latitude.
In 2025, Mendon recorded an average annual temperature of 50°F — about 2.2°F above the 30-year normal of 48°F. The hottest day reached 99°F in June; the coldest was 1°F in January. Total precipitation was 43 inches (drier than usual). Snowfall totaled 9 inches, below the 73-inch average. The wettest month was May.
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