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Relative humidity of 65 percent means what?

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  1. The air holds 65 percent of its maximum water vapor
  2. 65 percent of the air is water
  3. It will rain 65 percent of the day

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References

  1. FAA Pilot's Handbook of Aeronautical Knowledge (FAA-H-8083-25C), Chapter 12 Weather Theory www.faa.gov/regulations_policies/handbooks_manuals/aviation/faa-h-8083-25c.pdf Checked 2026-10-10.

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