Jerseyville, in Illinois, United States, is home to roughly 8,500 people in the Central Time Zone at 39.1°N latitude.
In 2025, Jerseyville recorded an average annual temperature of 55°F. The hottest temperatures reached 93°F in July; the coolest were -5°F in January. Total precipitation for the year was 35 inches, with the wettest month being April. Snowfall for the year totaled approximately 8 inches.
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