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The society for people who love the sky

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Today's Cloud-a-Day

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Cloud of the Month

July 2025

Circumhorizon Arc – The Horizontal HaloThe family of optical effects known as halo phenomena are caused by the Sun shining through cloud ice crystals that act like tiny, floating prisms and mirrors, bending and reflecting the light. The ‘halo’ in the name suggests these effects appear circular, or, at least, in the shape of arcs, but […]
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See past Clouds of the Month

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!

Get our free CloudSpotter app →

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. 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.

Get This Book →

Our Memory Cloud Atlas

On Cloud Appreciation Day, Friday September 13th, 2024, friends and members of the Cloud Appreciation Society contributed photographs of their skies to our Memory Cloud Atlas. The Atlas was open for contributions on this day only. It stands as a snapshot of a world looking up and appreciating the sky on one particular day.

Find out more about our Memory Cloud Atlas →

Recent Clouds Spotted

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New from our Members

Cloud Music
Mary Williamson, Member 54,343, found this video where ...
Cloud Poetry
Paul Davies, Member 28,330. wrote this descriptive piece ...
Cloud Videos
Maria Wronka, a cloud lover, created this educational ...
Cloud Music
Musician Max Roudenko recently told us about his ...

Cloud Appreciation Pack for schools

A Survival Kit for the Imagination

Our downloadable lesson plans and resources for schools and homeschools teaching about the sky.

News

June 25, 2025

Noctilucent Clouds: A Citizen Science Project

Noctilucent cloud season is upon us in the Northern Hemisphere, and NASA has a citizen science project for noctilucent cloudspotters to get stuck into. Forming in summer months at altitudes of around 50 miles (80.5 km), noctilucent clouds are Earth’s highest clouds. They are only visible during twilight hours, when the rest of the sky […]
June 17, 2025

Celebrating 250 Years of J.M.W. Turner

Timothy J Schmidt, Member 51,199 came across an article by journalist, Dan Mobbs, on the Invaluable.com blog celebrating 250 years of J.M.W Turner (1775-1851).  Mobbs’ tells us “as The Painter of Light, Turner’s work evolved from the precise topographical tradition of the 18th century towards something entirely new and abstract. His seascapes churned with drama […]
May 24, 2025

Cutting Contrails to Tackle Climate Change

When aircraft fly through air that’s moist enough and cold enough, they can leave strips of cloud known as a contrails, short for ‘condensation trails’, that can have a slight warming effect on ground temperatures below. Finding a way to eliminate contrails in an effort to reduce the climate impact of aviation is an area […]