Boulder (zip 80301), Colorado, gets 19 inches of rain per year. The US average is 39. Snowfall is 88 inches. The average US city gets 26 inches of snow per year. The number of days with any measurable precipitation is 58.
On average, there are 245 sunny days per year in Boulder (zip 80301), Colorado. The July high is around 88 degrees. The January low is 22. Sperling's comfort index for Boulder (zip 80301) is a 73 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.