How high up do the highest clouds float?

Clouds of the kind called cirrus, which is the Latin word for ‘curl’, float higher than those of any other kind, their average height above sea-level being about 10,000 meters (33,000 feet) – quite more than that of the world’s highest mountain. They are made up of tiny particles of ice, and are always white. They resemble, feathers or ribbons, spreading out like the ribs of a fan, and are sometimes called mare’s tails. Cirrus clouds are usually regarded as a sign of coming wind.

Additional reading:
Cirrus cloud (Wikipedia)
List of cloud types (Wikipedia)

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