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CoCoRaHS: Rain, Hail, Snow Network

Main Project Information
Goal Provide weather data to meteorologists
Task Measure rain, hail, and snow
Where 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.

As seen in Chapter 1 of Citizen Science by Caren Cooper.

How to Join

Visit the website to sign up as an observer. (Click on 'Join CoCoRaHS' in the upper right corner, or click here:
All participants are required to attend a training session - either on-line or via a walk-in training session.

Teachers: Find teaching materials here

Project Timing Daily measurements are preferably collected sometime between 4:30-9:30 AM, but not required.
Social Media
Expenses $35
Materials List Manual Rain Gauge
Ideal Age Group Elementary school (6 - 10 years), Middle school (11 - 13 years), High school (14 - 17 years), College, Graduate students, Adults, Families, Seniors
Ideal Frequency Every day
Average Time Less than an hour
Spend the Time outdoors
Type of Activity In snow or rain, At home, At school, At a science center, zoo or aquarium
Training Materials
Class Materials
Media Mentions
and Publications
Tags climate, girl scouts, hail, hurricane, national weather service, rain, snow, weather
Project Updated 02/23/2019