Welcome to CoCoRaHS!   "Volunteers working together to measure precipitation across the nations."

Reports received today 7/12/2024 as of 9:25 PM EDT
Daily Multi-day SigWx Hail Condition ET
12,499 183 10 2 25 107





CoCoRaHS officially began on June 17, 1998.  With a few observers along Colorado's Front Range, we had no idea that the network would become what it is today, with over 26,000 active observers in the United States, CanadaPuerto Rico, the U.S. Virgin Islands, Guam and the Bahamas. A truly remarkable effort by all of you.  Here's to many more successful years on the horizon. To read about the first 25 years of CoCoRaHS click here: History


The saying "Rain doesn’t fall the same on all" really proves to be true. How often have you seen it rain in your neighborhood and a few blocks away not a drop has fallen.

If you get the chance, please take a moment to tell a friend or neighbor about this exciting grassroots effort of citizens measuring precipitation right in their own backyards.  It's easy to join, takes only five minutes a day and is a fun way to learn about this wonderful natural resource that falls from the sky.  Your observations continue to give scientists an ever clearer picture of where and how much precipitation falls throughout our communities.

CoCoRaHS (pronounced KO-ko-rozz) is a grassroots volunteer network of backyard weather observers of all ages and backgrounds working together to measure and map precipitation (rain, hail and snow) in their local communities. By using low-cost measurement tools, stressing training and education, and utilizing an interactive Web-site, our aim is to provide the highest quality data for natural resource, education and research applications. The only requirements to join are an enthusiasm for watching and reporting weather conditions and a desire to learn more about how weather can affect and impact our lives.

Our Web page provides the ability for our observers to see their observations mapped out in "real time", as well as providing a wealth of information for our data users.

For more information, please click here: Information about CoCoRaHS

If you would like to sign-up as a volunteer observer and become part of our expanding network, please click here: "Join the CoCoRaHS Network".

Complimentary training is provided to help you become an effective weather observer.  Please check out your state page for a list of current training sessions in your local area.  If none are taking place at the current time, watch our YouTube animations or Training Slide Shows and read our on-line training information.

CoCoRaHS values the diversity of the group of individuals that makes up our volunteer network. At CoCoRaHS Headquarters, we value everyone’s right to free speech. However, we have zero tolerance for hate speech, bullying, or discrimination / harassment against any individual or group on the basis of race, religion, gender, gender identity, sexual orientation, age, or disability.

The personal views expressed by any individual who is a CoCoRaHS volunteer are their own views and may not reflect the values of CoCoRaHS Headquarters. Being a CoCoRaHS volunteer does not imply endorsement by CoCoRaHS of any statements made by the volunteer.

Those individuals who publicly advertise or broadcast an affiliation with CoCoRaHS must expect to be held to a higher standard. Therefore, any comments made (via speech, written, on social media, or by any other means) that do not align with this value statement will require action, up to and including termination from the CoCoRaHS network.


National Oceanic and Atmospheric Administration logo National Science Foundation National Weather Service logo National Hydrologic Warning Council
National Hydrologic Warning Council Wyoming State Climate Office National Mesonet Colorado State University logo

Click here to got to testimonial form

Click here to sign-up to become a weather observer with the CoCoRaHS Network


Download the iOS App from the Apple App Store

Download the Google Play App

Click here to view the article in Weatherwise magazine

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