Part 107 Plan

Part 107 test practice question: Weather

WeatherDifficulty 2/5

A METAR reports temperature 12 °C and dew point 12 °C at dawn with calm winds. What should the remote PIC expect?

  1. AFog or very low cloud forming, threatening visibility and VLOS
  2. BThunderstorms
  3. CHigh density altitude
  4. DStrong turbulence
Show answer and rationale

Correct: A. When the temperature–dew point spread approaches zero, air is saturated and fog forms — especially radiation fog on calm, clear nights. This threatens the 3 SM visibility minimum and VLOS.

  • D — Calm winds do not produce strong turbulence.
  • B — Thunderstorms need instability and lifting, not indicated here.
  • C — 12 °C is cool; density altitude is not the concern.

Concept being tested

11–16% of items. Weather sources (METAR, TAF), effects of density altitude, wind, temperature and humidity, fog, thunderstorms, icing, and how weather affects sUAS performance. — 14% of the exam. Study guide for Weather.

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Primary references

  1. Remote Pilot – Small Unmanned Aircraft Systems Airman Certification Standards (FAA-S-ACS-10B, April 2021) — Federal Aviation Administration (FAA) · government · retrieved 2026-09-21, verified 2026-09-21
  2. Advisory Circular 00-45H, Aviation Weather Services (METAR/TAF formats) — Federal Aviation Administration (FAA) · government · retrieved 2026-09-21, verified 2026-09-21
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