What Is a METAR, and How Often Are They Issued at Most Airports?

What Exactly Is a METAR?

A METAR — short for Aviation Routine Weather Report — is a standardized observation of current surface weather conditions at a specific airport. Think of it as a snapshot of what the atmosphere is doing right now at ground level. Every METAR follows a fixed international format, which means a pilot flying in the United States reads one the same way a pilot in Europe does. That standardization is intentional, and it is what makes METARs one of the most reliable and universally understood weather products in aviation.

According to the Aviation Weather Services FAA-AC-00-45, a routine METAR includes the following elements: wind direction and speed, prevailing visibility, present weather phenomena (like rain, fog, or snow), sky condition and cloud coverage, temperature and dew point, and the altimeter setting. Each of those elements directly affects your go or no-go decision, your fuel planning, and your in-flight situational awareness. During your oral exam, your designated pilot examiner will expect you to not only define a METAR but to demonstrate that you actually use it as a pilot.

How Often Are METARs Issued — and What Is a SPECI?

At airports equipped with automated or staffed weather observation capability, METARs are issued once per hour, typically at 55 minutes past the hour. That means when you pull up a METAR during preflight, you are looking at an observation that could be up to an hour old. For most routine flights in stable weather, that is perfectly adequate. But weather does not always cooperate with a fixed schedule, which is where special METARs come in.

A SPECI — or Special METAR — is issued between routine hourly reports whenever conditions change significantly. Common triggers for a SPECI include a rapid drop in visibility, a wind shift, the onset of thunderstorms, a tornado warning, or a ceiling dropping below certain thresholds. On your checkride, knowing that SPECIs exist demonstrates that you understand weather is dynamic, not static. A savvy examiner will appreciate that you do not just memorize issuance schedules — you understand why those schedules have exceptions built in.

The Zulu Time Detail Most Students Miss

Here is one of the most common mistakes student pilots make with METARs: forgetting that all METAR times are reported in Zulu time, also known as Coordinated Universal Time (UTC). Every timestamp on a METAR — from the issuance time to the observation time stamped in the header — is expressed in UTC, not local time. This is not a trivial detail. If you are planning a flight across time zones or filing any kind of weather briefing documentation, misreading the time stamp can put you dangerously out of sync with actual conditions.

For example, a METAR time stamp of 1455Z means the observation was taken at 1455 UTC. If you are flying on the East Coast of the United States during daylight saving time, that translates to 10:55 AM local time. Getting comfortable with Zulu time conversions before your checkride is not just good test prep — it is a fundamental habit of a safe pilot.

METAR vs. TAF: Do Not Confuse Current with Forecast

Another mistake that trips up checkride candidates is confusing a METAR with a TAF. A TAF — Terminal Aerodrome Forecast — is a weather forecast, typically covering a 24- or 30-hour period for an airport. A METAR, by contrast, is an observation. It tells you what the weather is, not what it is going to be. Both products are essential to a thorough preflight weather briefing, but they answer completely different questions.

During your oral exam, if your examiner asks about current conditions, you reach for the METAR. If they ask what conditions will be like at your destination in four hours, you reach for the TAF. Mixing them up signals to an examiner that your weather knowledge is shaky — and weather is one area where shakiness is not acceptable.

As you build your preflight planning routine, practice pulling up METARs through sources like aviationweather.gov and reading each element out loud. Learn to decode the coded format — TSRA means thunderstorm with rain, BKN means broken clouds, and so on — until it becomes second nature. The METAR is not just an exam topic; it is a tool you will rely on for every flight you ever make as a certificated pilot.

If you want to practice questions like this in a realistic oral exam format, try SimulatedCheckride.com.