Colchester is located in McDonough County, Illinois. There are roughly 289 residents, living in 128 households. The average temperature for Colchester this time of the year is low of 65F and high of 87F. On average, Colchester gets about 4.11 inches of precipitation in July. Most residents are home owners (76%), have a high school diploma (60%) and are single, no kids (41%).
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