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O'Fallon is located in Saint Charles County, Missouri. There are roughly 68,270 residents, living in 24,322 households. The average temperature for O'Fallon this time of the year is low of 67F and high of 89F. On average, O'Fallon gets about 3.94 inches of precipitation in July. Most residents are home owners (82%), have a post secondary degree (57%) and are married, with kids (31%).