With a population of around 2,300, Altamont sits in Illinois, United States. The city operates in the Central Time Zone.
In 2025, Altamont recorded an average annual temperature of 55°F. The hottest temperatures reached 95°F in September; the coolest were -2°F in January. Total precipitation for the year was 38 inches, with the wettest month being April. Snowfall for the year totaled approximately 8 inches.
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