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Cornell Lab of Ornithology




is run by

Colorado State University

photo of man and boy with rain gauge



CoCoRaHS is a large nationwide network of weather watchers. Using low-cost instruments (ruler, rain gauge and hail pad) volunteers measure and report all forms of precipitation (rain, hail and snow). We learn about our weather and climate as we collectively map precipitation across the entire country.


Open the CoCoRaHS website



weather, climate, precipitation, rain, hail, snow

individuals, families, schools, all ages

United States

research, education, climate monitoirng



Nolan Doesken, Project director and Colorado State Climatologist tiny email icon

Henry Reges, National Coordinator tiny email icon

   (970) 491-1196


Citizen science, volunteer monitoring, participatory action research... this site supports organizers of all initiatives where public participants are involved in scientific research.

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