Have you ever wondered why the local weather report says it rained an inch, but your garden still looks thirsty? Or why a sudden downpour flooded your street while your neighbor two blocks away stayed completely dry?

Weather is incredibly localized, and professional meteorologists often lack the "ground truth" data needed to see the full picture. That’s where you come in.

The Community Collaborative Rain, Hail & Snow Network, better known as CoCoRaHS, is looking for volunteer observers to help map precipitation across the country. Whether you’re a weather enthusiast, a gardener, or just someone who loves being part of a community project, CoCoRaHS offers a unique way to turn your backyard into a vital scientific outpost.

What is CoCoRaHS?

CoCoRaHS is a non-profit, community-based network of volunteers of all ages and backgrounds who measure and map precipitation (rain, hail, and snow). Since its start at Colorado State University in 1998, it has grown into a massive national effort involving tens of thousands of observers.

The goal is simple: provide high-quality, accurate precipitation data for daily use by meteorologists, hydrologists, and researchers.

Why Your Backyard Matters

Rain doesn't fall evenly. "Pop-up" summer thunderstorms can dump three inches of rain on one neighborhood while leaving another bone-dry. Official weather stations (usually located at airports) are often too far apart to catch these variations.

By reporting from your specific location, you provide a "piece of the puzzle" that helps:

The National Weather Service: Your reports can trigger flash flood warnings or verify radar estimates.

Emergency Managers: Local data helps officials respond to storm damage and flooding.

Farmers and Ranchers: Accurate rainfall maps are critical for crop management and drought monitoring.

Researchers: Scientists use this data to track everything from West Nile Virus (by monitoring mosquito breeding grounds) to long-term climate trends.

How to Get Started

Joining CoCoRaHS is easy, educational, and takes less than five minutes a day. Here is how you can become a certified observer:

Sign Up: Visit cocorahs.org and click the "Join Us" button to create an account.

Get the Gear: To ensure scientific accuracy, all volunteers use a standardized 4-inch diameter high-capacity rain gauge. These are more accurate than the small decorative gauges found at hardware stores.

Take Quick Training: You don’t need a degree in meteorology! CoCoRaHS provides short, easy-to-follow online training slide shows and videos to teach you how to read your gauge and report snow or hail.

Report Daily: Each morning (usually around 7:00 AM, though times are flexible), check your gauge and enter the amount on the CoCoRaHS website or via their mobile app. Even reporting "0.00" is vital information—it helps experts map the boundaries of a drought!

Be Part of the Mission

When you join CoCoRaHS, you aren't just measuring rain; you’re contributing to a national database used by organizations like NOAA and the National Science Foundation. You'll join a community of curious, civic-minded people who understand that every drop (or flake) counts.

Ready to make your mark on the map? Visit CoCoRaHS.org today to sign up!