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Standard sea level pressure and temperature

Remote Pilot (Part 107) practice question 14 of 25 on Weather / Effects on Performance. ACS element UA.III.B.K1c · difficulty: recall. Want to answer it in a timed quiz? Use the Remote Pilot (Part 107) practice mode.

Question bank updated 2026-09-22

QUESTIONUnder the International Standard Atmosphere, what are the standard sea level pressure and temperature?

  1. A29.92 inches of mercury and 59 °F (15 °C)
  2. B29.92 inches of mercury and 32 °F (0 °C)
  3. C1,013.2 inches of mercury and 59 °F (15 °C)
Show the answer and explanation

Correct answer: A. 29.92 inches of mercury and 59 °F (15 °C)

  • A — correct The study guide defines standard sea level pressure as 29.92 inches of mercury and standard temperature as 59 °F (15 °C).
  • B — incorrect The pressure figure is right, but the standard temperature is 59 °F (15 °C), not the freezing point.
  • C — incorrect 1,013.2 is the standard sea level pressure in millibars, not in inches of mercury.

BACKGROUND

The International Standard Atmosphere (ISA) provides a common reference and is the basis for most aircraft performance data. Standard sea level pressure is 29.92 inches of mercury with a standard temperature of 59 °F (15 °C). Atmospheric pressure is also reported in millibars; 1 inch of mercury equals approximately 34 millibars, and standard sea level pressure is 1,013.2 millibars. Surface charts, high and low pressure centers and hurricane data are reported in millibars.

STUDY TIP

Memorize the pair 29.92 inches of mercury / 59 °F (15 °C) and the millibar equivalent 1,013.2 mb.

KEY POINTS

  • ISA standard sea level pressure is 29.92 inches of mercury.
  • ISA standard sea level temperature is 59 °F (15 °C).
  • The same pressure in millibars is 1,013.2 mb.

SOURCES

  • remote_pilot_study_guide.txt ch3b "Measurement of Atmosphere Pressure"
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SkyDrill is not affiliated with the FAA. This is an original practice item based on 14 CFR part 107, 14 CFR part 89, and the FAA Remote Pilot – Small UAS Study Guide (FAA-G-8082-22). Regulations and handbooks are revised; confirm details against the current edition.