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Part 107 Weather Practice Questions

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Aviation weather is a critical component of the FAA Part 107 knowledge test, representing approximately 11–16 percent of exam questions. Weather directly impacts flight safety — understanding how to read weather reports and predict conditions can mean the difference between a safe mission and a dangerous one. Many test-takers find this topic challenging because it requires interpreting coded reports and understanding atmospheric science.

The exam focuses heavily on METARs (Meteorological Aerodrome Reports) and TAFs (Terminal Aerodrome Forecasts). METARs provide current observed conditions at an airport — wind speed and direction, visibility, cloud layers, temperature, and pressure. TAFs forecast conditions over a 24- to 30-hour period. You must know how to decode these reports: for example, "15012G20KT" means wind from 150 degrees at 12 knots, gusting to 20, and "BKN025" means a broken cloud layer at 2,500 feet AGL.

Density altitude is another heavily tested concept. It is pressure altitude corrected for nonstandard temperature and represents the altitude at which the current air density matches standard-atmosphere conditions. High temperature, high elevation, low pressure, and high humidity all increase density altitude — and reduce aircraft performance. Even electric drones are affected because thinner air decreases propeller efficiency and lift.

You should also understand weather hazards like microbursts (intense, localized downdrafts), wind shear, thunderstorms and their associated turbulence, temperature inversions (which trap fog and haze near the surface), and convective activity indicated by towering cumulus clouds. Knowing how these phenomena develop and how to avoid them is essential for safe UAS operations.

Practice Questions

Question 1 of 10 0%

1. What does the abbreviation METAR stand for, and what type of weather information does it provide?

Show explanation
A METAR is a Meteorological Aerodrome Report that provides a snapshot of current weather conditions observed at a specific airport or weather station, including wind, visibility, clouds, temperature, and pressure.

2. A remote pilot checks a METAR and sees the wind reported as '15012G20KT'. What does this mean?

Show explanation
In METAR format, the first three digits indicate wind direction (150 degrees), the next two indicate sustained speed (12 knots), and G20 indicates gusts to 20 knots. 'KT' means knots.

3. How does high density altitude affect small UAS performance?

Show explanation
High density altitude means the air is less dense, which reduces propeller efficiency and lift. This can decrease payload capacity, reduce climb rate, and shorten flight time for both electric and combustion-powered UAS.

4. A TAF is issued at 1800Z and is valid for 24 hours. What type of weather information does a TAF provide?

Show explanation
A Terminal Aerodrome Forecast (TAF) provides a forecast of expected weather conditions at a specific airport, typically covering a 24- or 30-hour period. It includes expected wind, visibility, clouds, and significant weather changes.

5. Which weather phenomenon poses the greatest risk to small UAS operations due to sudden, unpredictable wind changes?

Show explanation
Microbursts are intense, localized downdrafts that spread outward upon hitting the ground, creating dangerous and rapidly shifting winds. They can develop quickly and are extremely hazardous to small UAS due to sudden wind shear.

6. What effect does a temperature inversion have on weather conditions near the surface?

Show explanation
A temperature inversion occurs when warm air sits above cooler air at the surface. This stable layer traps moisture, smoke, and pollutants below it, often causing reduced visibility due to fog, haze, or smog.

7. A remote pilot observes towering cumulus clouds building rapidly near the planned flight area. What should the pilot expect?

Show explanation
Towering cumulus clouds (TCU) indicate strong convective activity and atmospheric instability. They are often a precursor to cumulonimbus (thunderstorm) clouds, which bring turbulence, gusty winds, heavy rain, and lightning.

8. Which factor increases density altitude?

Show explanation
Density altitude increases with higher temperature, higher humidity, higher elevation, and lower atmospheric pressure. Higher humidity reduces air density because water vapor molecules are lighter than nitrogen and oxygen molecules.

9. A remote pilot sees 'BKN025' in a METAR report. What does this indicate?

Show explanation
In METAR format, BKN means broken clouds (5/8 to 7/8 sky coverage) and 025 indicates the cloud base is at 2,500 feet above ground level. Cloud heights in METARs are always reported in hundreds of feet AGL.

10. What is the primary source of energy that drives all weather patterns?

Show explanation
The sun is the primary source of energy for all weather. Solar radiation heats the Earth's surface unevenly, creating temperature differences that drive atmospheric circulation, wind, cloud formation, and precipitation.

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Frequently Asked Questions

What weather topics are on the Part 107 exam?
The Part 107 exam covers METARs, TAFs, density altitude, wind shear, microbursts, thunderstorms, temperature inversions, cloud types, visibility, and how weather conditions affect small UAS performance.
Do I need to memorize METAR and TAF codes for Part 107?
Yes. You should be able to decode basic METAR and TAF reports, including wind direction and speed, visibility, cloud layers (SKC, FEW, SCT, BKN, OVC), and significant weather codes like RA (rain), TS (thunderstorm), and FG (fog).
How does weather affect drone flight performance?
Weather impacts drone performance through wind (increases power consumption), temperature extremes (cold reduces battery capacity, heat increases density altitude), humidity (decreases air density), and visibility (Part 107 requires at least 3 statute miles visibility).

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