2018 marks the 20th Anniversary of the Community Collaborative Rain, Hail & Snow Network, or CoCoRaHS. The network began on June 17, 1998 with just a handful of volunteer meteorological observers and has grown to over 20,000 volunteers across North America. Each time it rains, hails, or snows in their area, volunteers take measurements of the precipitation and the data is posted to the CoCoRaHS website. Current and historical data and maps about weather, climate, and precipitation can be downloaded off the site. Apps, publications, webinars, and educational tools are also available.
CoCoRaHS is sponsored by Colorado State University’s Colorado Climate Center. View their website for even more meteorological data. The Climate Center has also issued numerous publications which you can find in our library’s web catalog.