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O Fallon is located in Saint Charles County, Missouri. There are roughly 89,222 residents, living in 31,651 households. The average temperature for O Fallon this time of the year is low of 54F and high of 76F. On average, O Fallon gets about 4.3 inches of precipitation in May. Most residents are home owners (82%), have a post secondary degree (56%) and are married, with kids (32%).