Santa Rosa Valley, California, gets 15 inches of rain per year. The US average is 39. Snowfall is 0 inches. The average US city gets 26 inches of snow per year. The number of days with any measurable precipitation is 28.
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 45. Sperling's comfort index for Santa Rosa Valley is a 84 out of 100, where a higher score indicates a more comfortable year-around climate. The US average for the comfort index is 54. Our index is based on the total number of days annually within the comfort range of 70-80 degrees, and we also applied a penalty for days of excessive humidity.
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