Decatur is a city of approximately 9,500 people in Indiana, United States. Located in the America/Indiana/Indianapolis time zone at 40.8°N latitude.
In 2025, Decatur recorded an average annual temperature of 52°F. The hottest temperatures reached 92°F in June; the coolest were -4°F in January. Total precipitation for the year was 33 inches, with the wettest month being April. Snowfall for the year totaled approximately 8 inches.
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