Cairo is a city of approximately 1,700 people in Illinois, United States. Located in the Central Time Zone at 37°N latitude.
In 2025, Cairo recorded an average annual temperature of 60°F — about 1.5°F above the 30-year normal of 58°F. The hottest day reached 94°F in July; the coldest was 5°F in February. Total precipitation was 51 inches (near normal). The wettest month was April.
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