SESKStuff Everyone Should Know
SESK: Stuff Everyone Should Know · sesk.info/pilot-carb-ice-temperature

Per the FAA, carburetor icing can occur at outside air temperatures as high as about what?

As warm as 100°F, with humidity as low as 50 percent.

  1. 32°F
  2. 50°F
  3. 100°F ✔

Why: Fuel evaporating in the carburetor and the venturi's pressure drop can chill the air by 60 to 70 degrees Fahrenheit. So ice can form even on a warm day. It is most likely below 70°F with humidity above 80 percent.

Huh, didn't know that: Carburetor ice is especially dangerous during a reduced-power descent, when it can build unnoticed until power is added.

The dad joke
Why did the carburetor need a jacket on a warm day? Ice doesn't check the weather report.
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Sources

  1. FAA Pilot's Handbook of Aeronautical Knowledge (FAA-H-8083-25C), Chapter 7 https://www.faa.gov/regulations_policies/handbooks_manuals/aviation/faa-h-8083-25c.pdf

Test yourself in the game

Flying & DronesWith a fixed-pitch propeller, what is usually the first sign of carburetor ice?Flying & DronesWith carburetor ice present, what happens to RPM when full carburetor heat is applied?Flying & DronesAs an airplane climbs with the mixture left at full rich, the fuel-air mixture becomes what?

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