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Algonquin is located in McHenry County, Illinois. There are roughly 25,319 residents, living in 8,727 households. The average temperature for Algonquin this time of the year is low of 56F and high of 80F. On average, Algonquin gets about 4.3 inches of precipitation in June. Most residents are home owners (90%), have a post secondary degree (62%) and are married, with kids (36%).