Chester is a city of approximately 8,600 people in Illinois, United States. Located in the Central Time Zone at 37.9°N latitude.
In 2025, Chester recorded an average annual temperature of 58°F. The hottest temperatures reached 95°F in August; the coolest were 1°F in February. Total precipitation for the year was 41 inches, with the wettest month being April. Snowfall for the year totaled approximately 6 inches.
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