OFallon is a city of approximately 29,000 people in Illinois, United States. Located in the Central Time Zone at 38.6°N latitude.
Expect a humid continental climate in OFallon: average highs of 90°F in midsummer, lows near 24°F in midwinter, and an annual mean of 58°F. Precipitation totals roughly 43 inches per year and 11 inches of snow, concentrated around May, with February typically the driest month.
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