CoCoRaHS Information

Weather Observers are needed across northern Ohio and northwest Pennsylvania!

Interested in joining CoCoRaHS, but want to learn more? Join the "Community Collaborative Rain, Hail, and Snow Network (CoCoRaHS)" training on April 8, 2026 from 7-8 PM EDT. Click here to register.

What is CoCoRaHS?

CoCoRaHS is the Community Collaborative Rain, Hail, & Snow Network which currently has over 20,000 volunteers weather observers nationwide. This unique non-profit community based network consists of all ages and backgrounds in a collaborative effort to measure and map precipitation. This program originated in Colorado after the catastrophic Fort Collins flood occurred in 1997. This citizen science program offers a unique opportunity to measure precipitation and have it used by the National Weather Service, researchers, amongst many others!

If I volunteer, what will I be doing?

Each time it rains, snows, or hails, volunteers take measurements of precipitation. These precipitation reports are then recorded on the CoCoRaHS webpage. The data is displayed on an interactive map and organized in a way that is easy for end users to analyze and apply to daily situations, including water resource analysis and severe storm warnings. 

What will I need to participate in CoCoRaHS?

The only equipment you will need is a 4" cylindrical rain gauge. In order for reports to be consistent, the use of the 4" rain gauge is MANDATORY!

If you also want to measure snow, you will simply need a yardstick or ruler. 

"CoCoRaHS - Because Every Drop Counts!"

Consider joining CoCoRaHS - sign up today! 

Click here to sign up to be a CoCoRaHS observer.

Click here to view the CoCoRaHS page for Ohio.

Click here to view the CoCoRaHS page for Pennsylvania.

Thank you!