How to Read a New Zealand METAR (Step by Step)

If you are training for your PPL in New Zealand, the METAR is one of the first
real pilot documents you will have to read fluently. It looks like a wall of
code the first time you see it. It is not. A METAR is just the current weather
at an aerodrome, written in a fixed order, and once you know the order you can
read any of them.

This guide walks through a New Zealand METAR field by field, with a worked
example. By the end you will be able to decode one out loud.

What a METAR actually is

METAR stands for Meteorological Aerodrome Report. It is an observation: the
actual weather right now, measured at the aerodrome. That is the key difference
from a TAF, which is a forecast of what the weather is expected to do. A METAR
tells you what is happening; a TAF tells you what is coming.

New Zealand METARs are issued for the main aerodromes and follow the standard
ICAO format, so the skill transfers anywhere in the world.

The order never changes

Every METAR is written in the same sequence: report type, station identifier,
date and time, wind, visibility, present weather, cloud, temperature and dew
point, pressure (QNH), then any remarks or trend. Learn the order and decoding
becomes mechanical.

A worked example

Here is a typical METAR (illustrative):

METAR NZCH 250500Z 22015KT 9999 FEW020 SCT040 14/08 Q1018

Let us take it apart.

• METAR is a routine observation.
• NZCH is the station. NZCH is Christchurch. New Zealand ICAO codes start
  with NZ.
• 250500Z is the 25th of the month, at 0500 Zulu (UTC). This trips up new
  students: aviation weather is always in UTC, not New Zealand local time. You
  convert to local yourself.
• 22015KT is wind from 220 degrees true at 15 knots. Aviation winds in
  forecasts and reports are referenced to true north (the ATIS and tower, by
  contrast, give magnetic).
• 9999 is visibility of 10 km or more. If it were reduced you would see a
  figure in metres, for example 3000 for 3 km.
• FEW020 SCT040 is few cloud at 2,000 ft, scattered cloud at 4,000 ft.
  Heights are above aerodrome level, in hundreds of feet.
• 14/08 is temperature 14 degrees C, dew point 8 degrees C. The closer
  these two numbers are, the more moisture is in the air and the higher the risk
  of cloud and fog.
• Q1018 is a QNH of 1018 hectopascals. This is the pressure you set so your
  altimeter reads altitude above mean sea level.

The fields that catch students out

UTC not local time. Always. Get comfortable converting. METAR and TAF winds are
true, while spoken ATIS and tower winds are magnetic. A small temperature and
dew point spread is your early warning for fog and low cloud, which matters
enormously in New Zealand valleys and coastal areas.

Why understanding beats memorising

You could memorise that BR means mist and move on. But the moment you understand
that mist forms when temperature and dew point converge, you can look at a
report showing 14/13 with BR and predict that it may thicken to fog, rather than
just translating a code. That is the difference between reading a METAR and
understanding one, and it is exactly the difference ASPEQ tests when it rewords
a question.

Practise on real reports

The fastest way to get fluent is to read real METARs every day and compare them
to what you can see out the window. Decode one each morning until it is
automatic.