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We are looking for additional weather observers across Minnesota and Wisconsin


Because every drop (and snowflake) counts - Join CoCoRaHS! 


CoCoRaHS is the Community Collaborative Rain, Hail, & Snow Network, a group of over 20,000 volunteer precipitation observers nationwide.  CoCoRaHS observers measure precipitation (rain, hail, and snow) that falls at their location, and share the data online.  

Reports from CoCoRaHS observers are used by many organizations at the local, state and national level, including the National Weather Service.  By volunteering as an observer you become a citizen scientist, and play an important role in documenting how the weather affects your community. 

All you need to become an observer for CoCoRaHS is a standard 4 inch diameter rain gauge (shown in the photos above with links to vendors available on the CoCoRaHS website), and access to the internet to relay reports via the CoCoRaHS app or website. 

You can report daily, during the rain or snow season, or whenever you are able to take measurements.  It's up to you!  Any reports you can share are greatly appreciated.

We are especially in need of additional precipitation and snowfall reports from greater Minnesota and western Wisconsin. 

This map shows precipitation reports from Minnesota and Wisconsin during a recent snow event.  You can help us fill in the gaps with your measurements!   


Precipitation reports from 2 19 2021


What is CoCoRaHS?

For additional information on the network, to view data from CoCoRaHS observers across the country, or to sign up as an observer please visit the CoCoRaHS website at:


For additional information at the local level, please contact regional CoCoRaHS Coordinator Michelle Margraf, Observing Program Leader at the National Weather Service in Chanhassen, Minnesota at 952-368-2520 or


 CoCoRaHS - Join the Team! 


The nationwide volunteer Community Collaborative Rain, Hail, & Snow Network (CoCoRaHS) is a grass-roots effort to provide precipitation reports in as many locations as possible across the country. As the saying goes "the rain doesn't fall the same on all".  Due to the variability of precipitation, amounts can be quite different only a block or two away.  Help fill in the gaps!  The more observations, the better the understanding of the weather conditions that impact the area.  

The National Weather Service uses CoCoRaHS precipitation data daily in river forecast models, flood and drought forecasts, and precipitation and snowfall maps and tables.  Here's a link to where CoCoRaHS data are posted on our website:  (click on precipitation or snowfall above the map to view the reports)

CoCoRaHS observers can also send the National Weather Service real-time reports of severe weather including hail, flooding, blizzards, ice storms, wind damage, and excessive rainfall totals, which greatly assist meteorologists with determining the impact of storms on local communities. Your reports will make a difference!  

"Because Every Drop Counts"


CoCoRaHS March Madness 2021