Colorado State University’s Natural Resources Economy Lab (NREL), along with several other partners, has developed CitSci.org, a site where everyday citizens can go to contribute data and scientific research. Using the site, researchers can create a project, collect data, and view the results. For instance, one of the site’s projects is a the “Front Range Pika Project,” where volunteers log photos and data on sightings of this endangered mountain critter. Other projects include tree species mapping, water data, birdwatching observations, invasive species monitoring, beaver sightings, butterfly-plant interactions, an amphibian survey, and much more. You can log in to volunteer for any of the projects, or access the data to learn about the natural environment in Colorado and other states.
CSU also sponsors another, separate but also citizen-driven scientific data collection site, the Community Collaborative Rain, Hail & Snow Network, or CoCoRAHS. As suggested in its name, this site relies on citizen volunteers to collect meteorological data. You can use their site to find maps and data on precipitation, evapotranspiration, soil moisture, and climate.