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SESK: Stuff Everyone Should Know · sesk.info/sport-fog-dew-point

Fog or low cloud is most likely when the temperature and dew point are what?

Close together, meaning the air is nearly saturated.

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  1. Far apart
  2. Both below zero
  3. Close together ✔

Why: When the temperature and dew point are close together, the air is nearly saturated and moisture condenses into fog or low cloud. A small spread is a warning sign for pilots.

Huh, didn't know that: Fog is a cloud that is on the surface.

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References

Answer: Close together. When the temperature and dew point are close together, the air is nearly saturated and moisture condenses into fog or low cloud. A small spread is a warning sign for pilots.

  1. FAA Pilot's Handbook of Aeronautical Knowledge, Chapter 12 www.faa.gov/sites/faa.gov/files/14_phak_ch12.pdf
    dew point are close together
    Checked 2026-10-11.
  2. FAA Pilot's Handbook of Aeronautical Knowledge, Chapter 12 www.faa.gov/sites/faa.gov/files/14_phak_ch12.pdf
    Fog is a cloud that is on the surface.
    Checked 2026-10-11.

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