With a population of around 2,200, Waterloo sits in Indiana, United States. The city operates in the America/Indiana/Indianapolis time zone.
In 2025, Waterloo recorded an average annual temperature of 54°F. The hottest temperatures reached 90°F in July; the coolest were -7°F in January. Total precipitation for the year was 44 inches, with the wettest month being April. Snowfall for the year totaled approximately 8 inches.
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