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The society for people who love the sky

Welcome, artists, scientists, cloudspotters and dreamers. You've come to the right place!

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Today's Cloud-a-Day

Thursday 26th December 2024

George Prince (Member 47,920) spotted what looked like a rainbow in the round while walking on Mount Pluto, near Lake Tahoe, California, US. But this is no rainbow. It’s a 22-degree halo, caused by sunlight refracting as it shines through …

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Cloud of the Month

December 2024

Many optical effects caused by clouds exhibit precise, geometric shapes but not the corona. We embrace this often wonky light effect in Cloud of the Month for December...
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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.

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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 Art
Monica Rees, Member 58,527, of California came across ...
Cloud Music
Jill Willder, Member 35,562, reminded us of the ...
Cloud Art
Thellen Levey, Member 39,677, sent this image he ...
Cloud Videos
Massimiliano Squadroni sent us this timelapse taken on ...

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

Crepuscular rays over the Isle of Skye, Scotland.
December 20, 2024

Rapid Surge in global warming mainly due to reduced planetary albedo

In the journal Science, a team led by the Alfred Wegener Institute put forward a possible explanation in their study for the rise in global mean temperature: our planet has become less reflective because certain types of clouds have declined.Researchers find that part of the temperature rise in 2023 is due to a decline in […]
Lacunosus over Beaconsfield, United States
September 9, 2024

Why You Should Be Looking Up

Cloud Appreciation Society founder, Gavin Pretor-Pinney, Member 001, was recently invited to join Amanda Yorwerth on the podcast, Environment Matters. They discussed all things cloudlike along with Cloud Appreciation Day which is coming up this Friday, 13th September. You can listen to the Environment Matters Podcast here Image credit: Lacunosus over Beaconsfield, United States by […]
August 29, 2024

Earth’s Jet Stream: Creating the Seeds that Generate Clouds

Clouds form when water vapour condenses or freezes around tiny particles, called cloud condensation nuclei, that are suspended in the atmosphere. These particles are hygroscopic, meaning they attract water. Examples of cloud condensation nuclei, also called cloud seeds, include dust, ocean salt, and sulfuric acid particles. Often, entirely new particles are formed in the atmosphere […]