Friday, Jul 24, 2026 The claims desk. Receipts included. POWERED BY LENZ ↗
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SCIENCE

The Claim

A typical cloud has a volume of about 1 cubic kilometer.

Verified by Lenz ·

The Short Version

The 1 cubic kilometer figure is a widely used rule of thumb for a small fair-weather cumulus cloud. NOAA, USGS, and the Library of Congress all use that approximation in educational explanations. The main caveat is scope: cloud volumes vary greatly, so the figure should not be read as a general measured size for all clouds.

Caveats

  • The figure mainly applies to a fair-weather cumulus example, not to every cloud type.
  • Several key sources use 1 km³ as a simplified teaching model rather than a universal empirical average.
  • Cloud size varies widely by type, altitude, and weather conditions, so 'typical cloud' is imprecise wording.

The Receipts

  1. How much does a cloud weigh?

    Library of Congress

  2. How Much Does a Cloud Weigh?

    USGS

  3. How much does a cloud weigh?

    NOAA

  4. Cumulus clouds hold 1.1 million pounds of water - Facebook

    U.S. Geological Survey (quoted) via Facebook group repost

  5. How much do clouds weigh?

    University of Reading

  6. How Much Does a Cloud Weigh? - WeatherWorks

    WeatherWorks

  7. How Much Does a Cloud Weigh: More Than You'd Think

    Reddit (user discussion citing USGS)

  8. How much does a cloud actually weigh? ☁️⚖️

    Instagram (educational science content)

  9. Clouds can weigh thousands of pounds due to their liquid water ...

    AskFilo (educational Q&A)

  10. A single cumulus cloud — the kind that looks like a fluffy white pillow ...

    SpaceDaily

+ 4 more sources — see the full list on Lenz

Filed Under

Cloud