Santa Rosa Valley, California, gets 18 inches of rain per year. The US average is 37. Snowfall is 0 inches. The average US city gets 25 inches of snow per year. The number of days with any measurable precipitation is 31.
On average, there are 273 sunny days per year in Santa Rosa Valley, California. The July high is around 79 degrees. The January low is 42. Our comfort index, which is based on humidity during the hot months, is a 50 out of 100, where higher is more comfortable. The US average on the comfort index is 44.
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