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Johnson County, IA, gets 34 inches of rain per year. The US average is 37. Snowfall is 29 inches. The average US city gets 25 inches of snow per year. The number of days with any measurable precipitation is 104.
On average, there are 195 sunny days per year in Johnson County, IA. The July high is around 84 degrees. The January low is 10. Our comfort index, which is based on humidity during the hot months, is a 38 out of 100, where higher is more comfortable. The US average on the comfort index is 44.
Johnson, IA Climate data
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