How to Read a METAR: A Complete Guide for Drone Pilots

Before you fly a drone, you need to know the weather. Pilots use aviation weather reports called METARs.

A METAR is a coded message. It tells you wind, gusts, visibility, clouds, temperature, and more. The codes look confusing at first. But once you learn them, you decode a METAR in seconds.

In this article, we’ll learn what each METAR code means and the steps to decode a real METAR. We’ll also explore which weather matters most for drones, where to find METARs online, and the common mistakes drone pilots make.

Let’s first understand why METAR is important

What Is a METAR?

METAR stands for Meteorological Aerodrome Report. It gives you a snapshot of the weather observed at an airport or aviation weather station.

A METAR looks like a random string of letters and numbers:

Each group has a specific meaning. Once you learn the format, you can decode a METAR in seconds.

A METAR can tell you:

• Wind direction and speed
• Wind gusts
• Visibility
• Rain, snow, fog, or other weather
• Cloud cover and cloud height
• Temperature
• Dew point
• Altimeter setting
• Additional information in the remarks section

This information helps you understand the conditions before you launch.

Why Drone Pilots Need to Read METARs?

Strong winds reduce battery life. Gusts make drones hard to control. Gusts also ruin smooth video. Low visibility prevents visual line of sight. Rain damages equipment. Fog creates collision risk. A METAR shows you all this.

For Part 107 pilots, the FAA tests this knowledge. METARs are part of aviation weather. Commercial drone operators must understand the basics.

But here is the truth: a METAR shows you right now. It does not show what comes later. If you fly in a few hours, check a TAF (forecast) and radar.

A METAR is only one piece. It is not the whole picture. Weather fronts are another critical piece.

How To Read A METAR

Consider this example:

METAR KDEN 271653Z 12008KT 10SM FEW060 SCT100 28/14 A3012

Here is what each section means:

Now let’s break down each part.

1. Check the Report Type

A METAR begins with one of two codes:

• METAR = Routine weather report (issued hourly)
• SPECI = Special weather report (issued between routines when conditions change significantly)

For drone pilots: A SPECI deserves attention. It means weather has changed since the last regular METAR report.

2. Find the Weather Station

The next group usually identifies the reporting station.

For example: KDEN identifies Denver International Airport.

In the United States, airport identifiers often start with K in their four-letter ICAO format.

Examples include:

• KDEN — Denver International Airport
• KJFK — John F. Kennedy International Airport
• KLAX — Los Angeles International Airport
• KATL — Hartsfield-Jackson Atlanta International Airport

The station matters because the METAR describes conditions at that location. Your launch site may be several miles away. Terrain and local conditions can also create different weather.

Treat the METAR as one part of your weather check.

3. Read the Observation Time

The next group usually contains six digits followed by Z.

Example: 271653Z

Break it down like this:

• 27 = Day of the month
• 1653 = Time in hours and minutes
• Z = Zulu time, or UTC

So, 271653Z means the station observed on the 27th at 1653 UTC.

Always check the observation time before using a METAR for flight planning.

Weather can change quickly. A report from several hours ago may not reflect the conditions you will encounter at launch time.

4. Decode the Wind

Wind is one of the most important parts of a METAR for drone pilots.

A typical wind group looks like this: 12008KT

This means:

• 120 = Wind direction (coming from 120°)
• 08 = Wind speed (8 knots)
• KT = Knots

The wind is coming from 120° at 8 knots.

Remember: Aviation reports wind from its source. Not where it is going.

For example:

• 090 = Wind from the east
• 180 = Wind from the south
• 270 = Wind from the west

How to Read Wind Gusts

You may see: 12008G18KT

This means the wind comes from 120° at 8 knots. Gusts can reach 18 knots.

Gusts can affect your drone even when the sustained wind seems manageable. They can make takeoffs, landings, hovering, and smooth camera movements harder.

Always check the gust speed. Then compare it with your drone’s capabilities and your planned operation.

Variable wind direction

Example: VRB03KT

VRB means the wind direction is variable (changing). Speed is 3 knots.

You may also see: 18012KT 150V220. This means wind from 180° at 12 knots. It varies between 150° and 220°.

Calm winds: 00000KT means no wind.

5. Decode Visibility

Visibility usually follows the wind group.

For example: 10SM means visibility is 10 statute miles.

You may also see: 3SM, which means the visibility is 3 statute miles.

Low visibility can result from:

• Fog
• Mist
• Rain
• Snow
• Smoke
• Dust
• Haze

You may also see:
P6SM

The P means greater than. So, P6SM means visibility exceeds 6 statute miles.

For drone pilots, visibility matters because you need to maintain visual line of sight. Always consider the actual conditions at your operating site. Airport weather is not the whole story.

6. Understand Weather Codes

METARs use short codes for significant weather.

Here are some common examples:

You may also see symbols that show intensity:

• – = Light
• No symbol = Moderate
• + = Heavy

For example:

• -RA = Light rain
• RA = Moderate rain
• +RA = Heavy rain

Codes can also combine.

• TSRA means a thunderstorm with rain.
• -SHRA means light rain showers.

Pay close attention to thunderstorms and heavy precipitation. These conditions can create serious risks for drone operations.

7. Decode Cloud Cover

Cloud information uses four codes and a number. The number shows how high the clouds are. It is in hundreds of feet AGL

A number follows the cloud code. It represents the cloud-base height in hundreds of feet AGL.

For example:

• FEW020 means few clouds at 2,000 feet AGL.
• BKN008 means broken clouds at 800 feet AGL.

Multiple Cloud Layers

A METAR reports several cloud layers. It lists them from lowest to highest.

Example: FEW020 SCT050 BKN090

• Few clouds at 2,000 feet
• Scattered clouds at 5,000 feet
• Broken clouds at 9,000 feet

What Is a Cloud Ceiling?

A ceiling is the lowest broken or overcast cloud layer. Vertical visibility can also define a ceiling when reported.

For example:
BKN008 indicates a ceiling at 800 feet AGL.

Remember that a cloud base in a METAR does not set your legal drone altitude. FAA rules and the circumstances of your operation determine your operating limits.

8. Read Temperature and Dew Point

These appear together, separated by a slash.

Example: 28/14

• Temperature: 28°C
• Dew point: 14°C

Negative temperatures use M (minus)

Example: M02/M05

• Temperature: -2°C
• Dew point: -5°C

Why dew point matters

When temperature and dew point are close, air is nearly saturated. Fog risk increases.

Example:

• Temperature: 20°C
• Dew point: 19°C
• Difference: 1°C

A 1-degree difference does not guarantee fog, but it tells you to watch visibility closely.

9. Decode The Altimeter Setting

The altimeter setting starts with A and four digits.

Example:

• A3012 means 30.12 inches of mercury (inHg).
• A2992 means 29.92 inHg.

You mostly need to recognize this format and understand it represents barometric pressure. It affects how your drone’s altimeter reads.

10. Understand The Remarks Section

The remarks section starts with RMK. It adds more information.

• Pressure changes. PRESFR means pressure is falling fast.
• Precipitation rates or types
• Cloud movement
• Station equipment type (AO2 = automated station)
• Lightning
• Recent weather

You do not need to memorize all remarks codes. Learn the main format first, then add remarks knowledge as you need it.

A Complete METAR Example

Let’s decode this report:

Here is what it tells us:

• METAR — Routine weather report
• KGGG — Reporting station
• 161753Z — Observation on the 16th at 1753 UTC
• AUTO — Automated report
• 14021G26KT — Wind from 140° at 21 knots, gusting to 26 knots
• 3/4SM — Visibility of three-quarters of a statute mile
• +TSRA — Heavy thunderstorm with rain
• BR — Mist
• BKN008 — Broken clouds at 800 feet AGL
• OVC012CB — Overcast cumulonimbus clouds at 1,200 feet AGL
• 18/17 — Temperature 18°C and dew point 17°C
• A2970 — Altimeter setting of 29.70 inHg
• RMK — Remarks section
• PRESFR — Pressure falling rapidly

A drone pilot can quickly see that these are poor flight conditions.

The report shows strong and gusty winds. Visibility is very low. A thunderstorm is producing heavy rain. The report also shows low clouds and cumulonimbus clouds.

This example shows why you should read the entire METAR. One number never tells the whole weather story.

METAR vs. TAF: What’s the Difference?

The easiest way to remember the difference is:

• METAR = What is happening now?
• TAF = What is expected to happen?

You should use both when planning a drone flight.

For example, the latest METAR may show calm winds and clear skies. The TAF may predict strong winds and thunderstorms later in the day.

The METAR tells you what is happening. The TAF helps you plan for what comes next.

Where To Find METARs

You can find METARs from several sources:

1. Aviation Weather Center (AWC)

• Website: https://aviationweather.gov/
• Official FAA/NOAA source
• Free, no login required
• Includes METARs, TAFs, and aviation forecasts

2. CheckWX (checkwx.com)

• Pilot-friendly interface
• Free and paid options
• Shows METAR, TAF, and wind data

3. ForeFlight (paid subscription)

• Pilots use this widely.
• Mobile app with weather
• Shows METAR, TAF, radar, winds

4. AVWX

• Website: avwx.rest
• Developers use this service.
• API-based
• Free tier works

5. Local airport website

Many airports post METARs on their homepage. Look for links on airport pages.

Use the Aviation Weather Center or CheckWX. Both are free. Both have what you need.

How to Read a METAR Quickly

You do not need to decode every part equally. Use this priority order:

• Observation time: How old is this report?
• Wind: Direction, sustained speed, gusts, variability?
• Visibility: Fog, mist, rain affecting sight distance?
• Significant weather: Thunderstorms, heavy rain, snow, freezing conditions?
• Clouds: Low layers, overcast, cumulonimbus?
• Temperature and dew point: Difference between the two?
• Remarks: Any additional information that affects flight planning?

This method helps you spot issues in seconds.

Common METAR Mistakes Drone Pilots Make

Mistake 1: Treating a METAR as a forecast

A METAR shows what is happening now. It does not forecast the future. Check a TAF and radar before flying later.

Mistake 2: Focusing only on wind speed

Do not ignore gusts. An 8-knot wind with 18-knot gusts differs from steady 8 knots.

Mistake 3: Ignoring the observation time

Weather changes fast. A METAR from three hours ago may be outdated.

Mistake 4: Assuming airport weather matches your site

Terrain and buildings change weather. Wind, visibility, and clouds differ. Always check your actual operating site.

Mistake 5: Confusing cloud base with legal altitude

METAR cloud height does not determine your legal flying altitude. FAA rules do.

Mistake 6: Looking at one number in isolation

Do not check wind speed alone. Consider all factors together: wind, gusts, visibility, rain, clouds, temperature, and dew point.

Final Takeaway

You do not need to memorize every METAR code to use aviation weather information.

Start with the basic sequence:

Station –> Time–> Wind–> Visibility –> Weather–> Clouds –> Temperature/Dew Point –>Altimeter –>Remarks

Then ask one important question: What does this weather mean for my flight?

Focus first on wind, gusts, visibility, precipitation, thunderstorms, and cloud conditions. These factors can have a direct impact on your drone operation.

Remember that a METAR gives you a snapshot of observed weather. It does not replace a full preflight weather check.

Use the METAR with a TAF, radar, wind forecasts, and other current weather information. Then make your flight decision based on the complete picture.

Ready to master aviation weather?

Reading METARs is just the start. Master aviation weather, Part 107 rules, and safe drone operations with DroneU’s comprehensive training.

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