CoCoRaHS Canada

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Chatham, ON
CoCoRaHS Canada

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Now active in Saskatchewan and Manitoba. Volunteers then report the readings on our web site (www.cocorahs.org).

The Community Collaborative Rain, Hail, and Snow network (CoCoRaHS for short) is a non-profit, grass-roots, volunteer network of observers of all ages manually measuring precipitation in their backyards. Each time a rain, hail or snow storm crosses your area, volunteers take measurements of precipitation from as many locations as possible (s. The data is then displayed and organized for many of our end-users to analyze and apply to daily situations ranging from water resource analysis and severe storm warnings to neighbours comparing how much rain fell in their backyards. CoCoRaHS Canada is used by a wide variety of organizations and individuals. Meteorologists, hydrologists, emergency managers, city utilities (water supply, water conservation, storm water), insurance adjusters, engineers, mosquito control, farmers, outdoor enthusiast, teachers, students, and neighbours in the community are just some examples of those who visit our website and use our data. Precipitation is variable even over the shortest distances. By having volunteers monitor precipitation in their area, we can better capture this variability. Precipitation measurements are essential for public safety, agriculture, forestry, and flood monitoring, just to name a few. In fact, in 2011, Manitoba and parts of Saskatchewan experienced the worst flooding in over 300 years resulting in hundreds of millions of dollars in damages to homes, farmland, and infrastructure. Engineers that predict and monitor flooding need accurate rainfall and snowfall data to assist them in their decision making when responding to these types of emergencies. You can be part of the solution by becoming a CoCoRaHS volunteer.

10/03/2026

Success! Thanks to our volunteers who made an extra effort to report on Oct 1st. Across Canada there were nearly 560 reports submitted that day

Send a message to learn more

09/29/2026

Did you know the Precipitation Water Year runs from Oct 1 to September 30th each year? To start the Water Year off right, CoCoRaHS is challenging our volunteers to make a concerted effort to submit their reports on October 1st (as always, reports of zero precipitation are important so those count too!). If everyone participates there is a good chance the network could break its previous record of about 18000 reports in a single day. More info here on the Squall Line post. How high can we go?

The current "Squall Line" automatically displays on your screen after you enter your daily observation on the data screen.

09/24/2026

Have you considered joining one of the CoCoRaHS WxTalk webinars? You can check out the schedule of upcoming webinars and attend for free. Lots of interesting topics. Check the schedule here:

For over 15 years, CoCoRaHS WxTalk Webinars have been providing the public with an in-depth look at Meteorologic, Climatic, Hydrologic, and other pertinent subjects presented by leading experts in their fields. These easy-to-follow presentations are approximately sixty minutes long. The audienc...

07/01/2026

A great message from our founder, Nolan Doesken...anyone can be the one: https://youtu.be/PqbTHDCY-Gw?si=2KbyhgvLYgTbUxT9

More often than not one of our many CoCoRaHS volunteers records the most extreme rain or snow fall in a major storm. Happy Canada Day 🇨🇦 to all and thanks for your continued dedication to this important program!

Enjoy the videos and music you love, upload original content, and share it all with friends, family, and the world on YouTube.

04/24/2026

Some late season snowfall on both sides of the country! 🙃

Address

Chatham, ON

Website

http://www.cocorahs.org/Canada.aspx

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