What is the average annual rainfall in New York State? The NY precipitation average is just above 40 inches per year. This varies across the state by region, with the mountains receiving more than 50 inches per year. Statewide annual numbers have ranged from a low of 31.6 inches in 1964 to a high of 55.7 inches in 2011. The driest periods historically occurred in the late 1920s and in the 1950s. The wettest stretches were during the late 1970s … Continue reading New York Annual Precipitation Average