How to Read a METAR as a Drone Pilot

METAR stands for Meteorological Aerodrome Report. It is the standard format aviation uses to report current surface weather conditions at airports and weather observation stations around the world. If you want to understand what is happening in the air above your flight location, METAR is the most authoritative and current source available.

For pilots of traditional aircraft, reading METARs is a core skill taught in ground school. For drone pilots, it is less commonly discussed, but just as relevant. The data packed into a METAR string tells you almost everything you need to make a flight decision - once you know how to read it.

What a Real METAR Looks Like

Here is an actual METAR for Chicago Midway Airport (KMDW), the kind of observation that would be relevant to a drone pilot operating anywhere within several miles of that station:

At first glance, that looks like noise. By the end of this post, every piece of it will make sense.

Field-by-Field Breakdown

Field	What It Is	What It Means
KMDW	Station Identifier	ICAO airport code. "K" prefix means continental US. KMDW = Chicago Midway. You can look up any 4-letter ICAO code to find the corresponding station.
011554Z	Date/Time (Zulu)	Day 01 of the month, at 1554 UTC (Zulu time). METARs are always in UTC. Convert to local time based on your timezone. This observation was issued at 9:54 AM Central Standard Time.
27014G22KT	Wind	Wind from 270 degrees (due west) at 14 knots, gusting to 22 knots. The "G22" is the gust component. No G = no significant gusts reported. Knots are nautical miles per hour; multiply by 1.15 for mph (14 kts = 16 mph, 22 kts = 25 mph).
10SM	Visibility	10 statute miles of visibility. This is the number that matters for Part 107 compliance. The FAA requires 3 SM minimum. 10SM means visibility is essentially unlimited for practical purposes.
FEW020	Cloud Layer 1	Few clouds at 2,000 feet AGL. Cloud heights in METARs are always in hundreds of feet AGL. "020" = 2,000 feet. FEW = 1-2 oktas (less than 2/8 sky coverage). Few clouds do not create a ceiling.
BKN060	Cloud Layer 2	Broken clouds at 6,000 feet AGL. BKN = 5-7 oktas (more than half sky covered). BKN and OVC layers define the ceiling. This layer puts the ceiling at 6,000 feet - plenty of room under Part 107 operating limits.
OVC090	Cloud Layer 3	Overcast at 9,000 feet AGL. OVC = 8 oktas (complete sky coverage). When multiple layers are reported, the lowest BKN or OVC layer defines the ceiling.
08/02	Temperature / Dewpoint	Temperature 8 degrees Celsius, dewpoint 2 degrees Celsius. Cold enough to affect battery performance. The gap between temperature and dewpoint (6 degrees) indicates relatively low humidity and no immediate fog risk.
A2985	Altimeter Setting	Altimeter setting of 29.85 inches of mercury. Relevant for density altitude calculations. Standard pressure is 29.92 inHg; lower pressure = higher density altitude.
RMK AO2	Remarks	AO2 indicates an automated station with a precipitation sensor. Remarks can include additional significant weather, sea level pressure (SLP113 = 1011.3 hPa), and other observations.

Reading Cloud Coverage: The Okta System

Cloud coverage in METARs uses four standard descriptors, each representing a range of sky coverage in eighths (oktas):

• SKC / CLR - Clear sky (0 oktas). No clouds reported.
• FEW - Few clouds (1-2 oktas). Less than one-quarter coverage. Not a ceiling.
• SCT - Scattered clouds (3-4 oktas). Three to four eighths coverage. Not a ceiling.
• BKN - Broken clouds (5-7 oktas). More than half the sky is covered. This establishes a ceiling.
• OVC - Overcast (8 oktas). Complete cloud coverage. This is a ceiling.

The ceiling is the height of the lowest BKN or OVC layer. In the example METAR above, the BKN060 layer establishes a ceiling at 6,000 feet AGL. Part 107 requires you to stay 500 feet below that, so the regulatory operational ceiling would be 5,500 feet - well above the 400-foot operating limit anyway.

Wind Direction: Thinking Like a Pilot

Wind direction in METARs is reported as the direction the wind is coming FROM, in degrees true north. This is standard aviation convention.

"27014KT" means wind from 270 degrees (due west) at 14 knots. If you are flying with that wind, it will push your aircraft to the east. On your return leg, you will be fighting into a headwind.

Variable winds are reported as "VRB" with just a speed: "VRB05KT" means winds are shifting direction at 5 knots. Light variable winds are generally fine. Variable winds above 10 knots suggest gusty, unstable air.

Special Phenomena Codes

Between the visibility and cloud layer fields, METARs often include present weather codes. These follow a standard format using letter codes:

• -RA - Light rain. The hyphen means light intensity.
• RA - Moderate rain (no prefix = moderate).
• +RA - Heavy rain. Plus sign means heavy.
• TSRA - Thunderstorm with rain. Do not fly.
• FG - Fog. Check visibility number carefully.
• BR - Mist. Visibility 5/8 to 6 statute miles.
• HZ - Haze. Reduced visibility from dust or smoke.
• SN - Snow. Relevant for cold weather battery concerns.

A METAR with "TSRA" in the weather field means there is a thunderstorm with rain at the station. You are not flying. A METAR with "-RA" means light rain. Your drone is not waterproof, and you are not flying. The weather codes are one of the clearest no-fly signals in the entire report.

How METARs Are Issued

Standard METARs are issued once per hour, typically at 50 to 55 minutes past the hour. When significant weather changes occur, stations issue SPECIs (Special Observations) between the regular reports. If conditions deteriorate rapidly, you might see multiple SPECIs within an hour.

The practical implication for drone pilots: a METAR can be up to an hour old. A report from 45 minutes ago that showed a broken ceiling at 2,500 feet might not reflect current conditions if a front has moved through. Always check the timestamp and cross-reference with current radar.

Putting It Together: A Quick Decision Example

Here is a METAR that would concern a drone pilot:

Decoding this: wind from the south at 22 knots gusting to 35 knots, 3 statute miles visibility in light rain, broken ceiling at 800 feet, overcast at 1,500 feet, temperature 7 Celsius, dewpoint 5 Celsius.

That is a no-fly. The gusts alone (35 knots = 40 mph) would exceed the rated limit of most consumer drones. Add light rain on an unprotected aircraft, a ceiling at 800 feet, and visibility right at the legal minimum, and there is no decision to make.

Or, Skip the Decoding

Reading METARs is a genuinely useful skill, and understanding what the data means makes you a better pilot. But on a typical shooting day, you need a fast answer, not a translation exercise.

Good To Drone pulls live METAR data from nearby observation stations automatically and presents the relevant numbers directly: wind speed and gusts in mph, visibility in statute miles, ceiling altitude in feet. No decoding required. You still get the benefit of authoritative aviation weather data without having to parse the raw format before every flight.