Precipitation and Snowfall Daily Weather Observations 1947-May 2018 : temperature, rainfall and snow. Community Collaborative Rain and Hail Study: Precipitation/Snow/Hail measurement. Monthly Precipitation from 1893 to May 2018 Average annual Colorado precipitation Monthly Snowfall from 1889 to May 2018 Daily Snowfall records. Colorado snowpack and river basin data. USDA Colorado snow products and Colorado Basin Graphics WRCC Snotel data and maps. First and Last day of snow in Boulder. Boulder weather station history.