With a population of around 3,000, Green Rock sits in Illinois, United States. The city operates in the Central Time Zone.
In 2025, Green Rock recorded an average annual temperature of 52°F — about 2.4°F above the 30-year normal of 50°F. The hottest day reached 97°F in June; the coldest was -11°F in January. Total precipitation was 33 inches (drier than usual). The wettest month was July.
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