Martinsville, in Illinois, United States, is home to roughly 1,100 people in the Central Time Zone at 39.3°N latitude.
In 2025, Martinsville recorded an average annual temperature of 55°F — about 1.4°F above the 30-year normal of 53°F. The hottest day reached 94°F in June; the coldest was -6°F in December. Total precipitation was 42 inches (wetter than usual). The wettest month was April.
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