Get latest weather reports from weather stations worldwide

• Source Code
• API documentation
• Rubygem
• Continuous Integration

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

require 'rubygems' if RUBY_VERSION < '1.9'
require 'metar'

This prints the latest weather report for Portland International Airport:

station = Metar::Station.find_by_cccc('KPDX')
puts station.report.to_s

List countries:

puts Metar::Station.countries

Find a country's weather stations:

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

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

metar_string = "KHWD 280554Z AUTO 29007KT 10SM OVC008 14/12 A3002 RMK AO2 SLP176 T01390117 10211\n"
raw    = Metar::Raw::Data.new(metar_string)
parser = Metar::Parser.new(raw)

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.

• Joe Yates
• Derek Johnson
• Florian Egermann and Mathias Wollin

Other Ruby libraries offering METAR parsing:

• ruby-metar
• ruby-wx

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:

• noaa
• noaa-weather

• Interactive map