Bloomington, Illinois, gets 38 inches of rain per year. The US average is 39. Snowfall is 21 inches. The average US city gets 26 inches of snow per year. The number of days with any measurable precipitation is 70. On average, there are 194 sunny days per year in Bloomington, Illinois. The July high is around 85 degrees. The January low is 17. Sperling's comfort index for Bloomington is a 37 out of 100, where a higher score indicates a more comfortable year-around climate. The US average for the comfort index is 54.