The society for people who love the sky
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Today's Cloud-a-Day
Wednesday 10th September 2025
Nisa Dykstra, daughter of Linda Kimbrel (Member 24,116), spotted this arcus formation from Pensacola Beach, Florida, US. An arcus, also known as a shelf cloud, is a feature that can appear at the front base of a Cumulonimbus storm cloud or…
Cloud of the Month
September 2025
Friday September 12th
is Cloud Appreciation Day!
Once a year, on Cloud Appreciation Day, people from around the world pause to look up. They capture their sky and describe how it makes them feel — creating a shared, emotional snapshot of our planet’s atmosphere.
These individual moments are brought together in the Memory Cloud Atlas, a global archive of sky photos and feelings — a lasting record of people around the world pausing to reflect on the atmosphere we all share.
In 2025, Cloud Appreciation Day takes place on Friday, September 12th. The Memory Cloud Atlas opens for contributions on this day only — for 24 hours, anyone anywhere can contribute their sky and say how it made them feel.
Download Our Free CloudSpotter App
Discover the wonders of clouds with our CloudSpotter app.
Discover the amazing world of clouds with your pocket guide to the wonders of the sky and have your spottings verified as you build a collection of clouds.
Our CloudSpotter app will teach you how to spot 58 different cloud formations and optical effects, from the common ones like Cumulus clouds and rainbows to rare ones like the fleeting fluctus cloud or the hard to spot circumzenithal arc. Learn what makes each formation special with expert text from the Cloud Appreciation Society and stunning reference photographs by our app users around the world.
Build up your own Collection of spottings and use our innovative tools to find out what type of clouds or optical effects you’ve spotted. See New Spottings by other users around the world and say (with our help) if you think they got the clouds right. CloudSpotter can even analyse your image and say what cloud types it thinks you’ve spotted. Becoming an expert cloudspotter has never been easier or more fun!
Cloudspotting for Beginners
A collaboration with award-winning illustrator William Grill, Cloudspotting for Beginners is a stunning introduction to clouds and the sky. We are very proud of this beautiful hardback book, which has been shortlisted for the prestigious Wainwright Prize (Children’s Non-fiction) for nature writing. Charming, uplifting, and easy to understand for all ages, Cloudspotting for Beginners will inspire anyone curious about clouds to look up at the sky with a new understanding and appreciation.
New from our Members
A Survival Kit for the Imagination
Our downloadable lesson plans and resources for schools and homeschools teaching about the sky.
News
We Take Clouds For Granted
How microbes living in the clouds affect our lives
