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Updated 02/05/2016
Participation fee $0
Expenses $30
Spend the time outdoors
Appropriate for kids yes
Teaching materials no

Required Gear:

A high capacity 4-inch-diameter rain gauge (ask your State Coordinator or follow links from the CoCoRaHS website).
A 12" x 12" Styrofoam pad and heavy duty aluminum foil for making a Hail Pad.
A computer or smart device with an internet connection.

CoCoRaHS: Rain, Hail, Snow Network

Provide weather data to meteorologists
Measure rain, hail, and snow

Project locations:

  • Canada
  • Puerto Rico, United States of America
  • The Bahamas
  • United States of America
  • United States Virgin Islands, United States of America

CoCoRaHS, The Community Collaborative Rain, Hail, and Snow Network is a unique, non-profit, community-based network of volunteers of all ages who measure and report precipitation. By using low-cost measurement tools, stressing training and education, and utilizing an interactive website, our aim is to provide the highest quality data for natural resource, education and research applications.

Each time a rain, hail, or snow storm occurs, volunteers take measurements of precipitation from their registered locations (reports of 'zero' precipitation are encouraged too!). The reports are submitted to the website and are immediately available for viewing. It's educational, but moreover, fun! Just wait until you start comparing how much rain fell in your backyard vs. your neighbor!

The data are used by the National Weather Service, meteorologists, hydrologists, emergency managers, city utilities, insurance adjusters, the U.S. Department of Agriculture, engineers, mosquito control, ranchers and farmers, outdoor and recreation interests, teachers, students, and neighbors in the community.

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