Reading the METAR and decoding the weather observation that tells you what the airport looks like right now

A METAR (Meteorological Aerodrome Report) is a standardized snapshot of observed weather at a specific airport at a specific time. It is not a forecast — it is what a trained observer or automated system measured right now. Every METAR follows the same group order, and once you learn that order, reading one becomes as natural as reading a sentence.

What Does METAR Stand For and What Does It Tell You?

METAR originates from the French phrase for aviation routine weather report. What matters is its function: it delivers a real-time photograph of airport weather conditions — wind, visibility, clouds, temperature, pressure, and any significant weather phenomena — encoded into a single line of text.

Here is a sample METAR to reference throughout this guide:

KABE 191853Z 18010 10SM FEW025 SCT045CB BKN040 24/17 A2992 RMK SFAO

How Do I Read the Station Identifier?

The first group is always the airport identifier. In the United States, station codes begin with K followed by the three-letter airport code. KABE is Allentown, Pennsylvania — Lehigh Valley International. Every METAR starts by telling you which airport is reporting.

What Do the Date and Time Numbers Mean?

The second group is the observation date and time in Zulu (UTC). The format is DDHHMMz — the first two digits are the day of the month, the next four are the time in Coordinated Universal Time.

191853Z means the 19th day of the month at 1853 UTC (6:53 p.m. UTC). METARs never use local time. To convert, apply your time zone offset: Eastern Daylight Time is UTC minus 4, Central Daylight is UTC minus 5, and so on.

Most routine METARs are issued at 53 minutes past the hour, giving time for encoding and distribution before the top of the next hour. If you see the word SPECI before this group, it indicates a special observation — something changed rapidly between routine reports, such as a sudden visibility drop or thunderstorm arrival.

How Do I Decode the Wind Group?

The wind group uses the format DDDSS(G##)KT:

• First three digits — wind direction in degrees true north. 180 means wind from due south.
• Next two or three digits — speed in knots. 10 means ten knots.
• G## — gusts, if present. 18010G20KT means south wind at 10 knots, gusting to 20.

The difference between steady wind and gust speed is what separates a stable approach from a challenging one. If you see VRB replacing the direction, the wind is too light and variable to assign a heading. A variable group in remarks such as 150V210 means the wind direction is swinging between 150 and 210 degrees — critical information for runway selection.

00000KT means calm wind, which is actually uncommon.

What Does the Visibility Number Tell Me?

Visibility is reported in statute miles (SM). 10SM is the maximum reported value in the United States and indicates essentially unrestricted visibility.

Fractions appear when conditions deteriorate: 1 1/2SM, 3/4SM, 1/4SM. When visibility drops below 3 statute miles, VFR pilots need to evaluate carefully. The basic VFR minimum in Class G airspace during the day is 1 statute mile visibility and clear of clouds — but legal and safe are not the same thing.

How Do I Read the Weather Phenomena Codes?

Weather groups follow a consistent structure: intensity + descriptor + precipitation type.

Intensity prefixes:

• - (minus) = light
• (no symbol) = moderate
• + (plus) = heavy

Common descriptors:

• TS = thunderstorm
• FZ = freezing
• SH = showers
• BL = blowing

Common precipitation types:

• RA = rain
• SN = snow
• FG = fog
• BR = mist
• HZ = haze

Examples: -RA is light rain. +TSRA is a heavy thunderstorm with rain. FZRA is freezing rain — a serious hazard that demands immediate attention.

If no weather group appears, conditions are clear of significant weather phenomena. If TS appears anywhere in the group, a thunderstorm is occurring at or near the airport. That is a no-go for any aircraft.

How Do I Determine the Cloud Ceiling?

Sky condition groups use a three-letter code plus a three-digit height (in hundreds of feet AGL — above ground level, not sea level):

• FEW = few clouds (1/8 to 2/8 coverage)
• SCT = scattered (3/8 to 4/8 coverage)
• BKN = broken (5/8 to 7/8 coverage)
• OVC = overcast (8/8 coverage)

SCT045 means scattered clouds at 4,500 feet AGL. BKN040 means broken clouds at 4,000 feet AGL.

The ceiling is defined as the lowest layer reported as broken or overcast. Scattered and few layers do not constitute a ceiling. In the example above, BKN040 is the ceiling at 4,000 feet — not the scattered layer at 4,500.

This distinction matters for VFR weather minimums. In Class C and D airspace, you need at least a 1,000-foot ceiling. An OVC008 (overcast at 800 feet) puts you below VFR minimums. Examiners on checkrides specifically test whether you can correctly identify the ceiling from a METAR — a report of SCT020 OVC050 has a ceiling of 5,000 feet, not 2,000.

Why Does the Temperature-Dew Point Spread Matter?

The temperature/dew point group appears as TT/DD in Celsius. 24/17 means a temperature of 24°C and a dew point of 17°C. The letter M before a number indicates below zero (e.g., M02 = minus 2°C).

The spread between temperature and dew point is a critical indicator. As the two values converge, the air approaches saturation, and fog or low clouds become increasingly likely. A rule of thumb: when the spread narrows to 2–3°C, expect visibility issues. Evening flights are particularly vulnerable — if temperature is dropping toward the dew point, clear departure conditions can turn into a fog-covered runway on return.

What Is the Altimeter Setting and Why Does It Matter?

The altimeter setting follows the format Annnn — “A” followed by four digits representing inches of mercury. A2992 means an altimeter setting of 29.92 inHg. Set this value in your altimeter’s Kollsman window for accurate altitude readings.

Failing to update your altimeter setting to the nearest reporting station introduces altitude error. The memory aid “high to low, look out below” captures the risk: flying from high pressure into lower pressure without resetting causes the altimeter to read higher than actual altitude, putting you closer to terrain than indicated.

What Useful Information Hides in the Remarks Section?

The remarks section (after RMK) is often skipped by students but contains valuable data:

• AO1/AO2 — station type (AO2 has a precipitation discriminator)
• Peak wind — the strongest gust since the last observation
• Precipitation begin/end times
• Sea level pressure
• Lightning and cumulonimbus information
• Variable ceiling groups — if the ceiling is fluctuating between, say, 800 and 1,200 feet, this section reports it

That ceiling fluctuation can mean the difference between VFR and IFR conditions at your estimated arrival time.

How Should I Use a METAR in Flight Planning?

A METAR is one piece of a complete weather briefing. Pair it with:

• TAF (Terminal Aerodrome Forecast) — forecast conditions for your arrival time
• Winds and temperatures aloft — for cruise altitude planning
• AIRMETs and SIGMETs — for hazards along your route

Consider this destination METAR: SCT035, BKN050, 7SM, 27015G25KT, temp/dew point spread of 4°C. The 5,000-foot ceiling and 7-mile visibility support VFR flight. But westerly winds gusting to 25 knots affect runway selection and approach stability. The 4°C spread is adequate now, but an evening arrival as temperatures cool means that spread will tighten — check the TAF.

How Do I Get Fluent at Reading METARs?

Read one every day, even when you are not flying. Pull up the METAR for your home airport each morning, decode it, and compare it to conditions outside. Within a few weeks, the codes become language rather than puzzles.

The Airman Certification Standards for the private pilot certificate require you to obtain and interpret weather information, explicitly including METARs. Your examiner will hand you one and expect fluent interpretation — not a slow walk-through with a decoder card. The FAA’s Aviation Weather Services advisory circular and the Pilot’s Handbook of Aeronautical Knowledge are free references that cover everything discussed here.

Key Takeaways

• METARs follow a fixed group order — station, date/time, wind, visibility, weather, sky condition, temp/dew point, altimeter, remarks — making them predictable once you learn the sequence.
• A ceiling is the lowest broken or overcast layer only — scattered and few do not count as ceilings, a common checkride error.
• Temperature-dew point spread below 2–3°C signals likely fog or low cloud formation, especially during evening cooling.
• Always update your altimeter setting to the nearest reporting station to avoid dangerous altitude errors.
• A METAR is a snapshot, not a forecast — pair it with TAFs, winds aloft, and AIRMETs/SIGMETs for a complete weather picture.