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Crystal Lake is located in McHenry County, Illinois. There are roughly 38,159 residents, living in 13,398 households. The average temperature for Crystal Lake this time of the year is low of 57F and high of 79F. On average, Crystal Lake gets about 4.3 inches of precipitation in June. Most residents are home owners (81%), have a post secondary degree (64%) and are married, with kids (32%).