With a population of around 5,000, Fairfield sits in Illinois, United States. The city operates in the Central Time Zone.
In 2025, Fairfield recorded an average annual temperature of 56°F. The hottest temperatures reached 92°F in July; the coolest were -6°F in January. Total precipitation for the year was 44 inches, with the wettest month being April. Snowfall for the year totaled approximately 6 inches.
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