Hamilton, Montana, gets 12 inches of rain per year. The US average is 37. Snowfall is 26 inches. The average US city gets 25 inches of snow per year. The number of days with any measurable precipitation is 90.
On average, there are 158 sunny days per year in Hamilton, Montana. The July high is around 85 degrees. The January low is 17. Our comfort index, which is based on humidity during the hot months, is a 68 out of 100, where higher is more comfortable. The US average on the comfort index is 44.