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A Ruby library for METAR weather reports
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Get latest weather reports from weather stations worldwide

The information comes from the National Oceanic and Atmospheric Association's raw data source.


require 'metar'


Hello World

This prints the latest weather report for Portland International Airport:

station = Metar::Station.find_by_cccc('KPDX')


List countries:

puts Metar::Station.countries

Find a country's weather stations:

spanish = Metar::Station.find_all_by_country('Spain')

Get The Data

station = Metar::Station.find_by_cccc('KPDX')
parser  = station.parser
puts parser.temperature.value

Use Your Own Raw Data

metar_string = "KHWD 280554Z AUTO 29007KT 10SM OVC008 14/12 A3002 RMK AO2 SLP176 T01390117 10211\n"
raw    =
parser =


Translations are available for the following languages (and region):

  • :de
  • :en
  • :'en-US'
  • :it
  • :'pt-BR'
  • Thanks to the I18n gem's fallback mechanism, under regional locales, language generic translations will be used if a region-specific translation is not available. I.e.
I18n.locale = :'en-US'
I18n.t('metar.station_code.title') # station code


By default, the parser runs in 'loose' compliance mode. That means that it tries to accept non-standard input.

If you only want to accept standards-compliant METAR strings, do this:

Metar::Parse.compliance = :strict



This version introduces a major change to the Metar::Raw class.

Previously, this class downloaded METAR data from the NOAA FTP site. The old functionality has been moved to Metar::Raw::Noaa. The new class, Metar::Raw::Data accepts a METAR string as a parameter - allowing the user to parse METAR strings without necessarily contacting the NOAA.


Alternative Software


Other Ruby libraries offering METAR parsing:

There are many reports (WMO) that these libraries do not parse.

There are two gems which read the National Oceanic and Atmospheric Association's XML weather data feeds:


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