Rhode Island, Rhode Island, gets 47 inches of rain per year. The US average is 37. Snowfall is 34 inches.The average US city gets 25 inches of snow per year. The number of days with any measurable precipitation is 116. On average, there are 202 sunny days per year in Rhode Island, Rhode Island. The July high is around 81 degrees. The January low is 20.hode Island, Rhode Island, gets 47 inches of rain per year. The US average is 37. Snowfall is 34 inches.