Garretson is a city of approximately 1,200 people in South Dakota, United States. Located in the Central Time Zone at 43.7°N latitude.
In 2025, Garretson recorded an average annual temperature of 48°F — about 2.8°F above the 30-year normal of 45°F. The hottest day reached 98°F in June; the coldest was -20°F in February. Total precipitation was 29 inches (near normal). The wettest month was August.
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