Weather theoryQuestion 332 of 934

The surface temperature is 74 °F and the dew point is 52 °F. Temperature and dew point converge at 4.4 °F per 1,000 feet. What is the approximate cloud base?

  1. 2,200 feet AGL
  2. 3,800 feet AGL
  3. 9,700 feet AGL
  4. 5,000 feet AGL
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Correct answer: 5,000 feet AGL

The spread is 22 °F. Divide by 4.4 °F and multiply by 1,000 to get 5,000 feet AGL.

Source: Pilot's Handbook of Aeronautical Knowledge (FAA-H-8083-25C), Chapter 12: Weather Theory — Moisture and Temperature, page 298

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Questions last reviewed: 18 October 2026