Get latest weather reports from weather stations worldwide

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

require 'metar'

This prints the latest weather report for Portland International Airport:

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

The parser needs to know the full date when the reading was taken. Unfortunately, the METAR string itself only contains the day of the month.

Use Metar::Raw::Data and supply the date as the second parameter:

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

Use Metar::Raw::Metar - the library will choose the date as the most recent day with the day of the month indicated in the METAR string:

I.e. on 11th April 2016:

metar_string = "KHWD 280554Z AUTO 29007KT 10SM OVC008 14/12 A3002 RMK AO2 SLP176 T01390117 10211\n"
raw    = Metar::Raw::Metar.new(metar_string)
raw.time.to_s                              # => "2016-03-28"
parser = Metar::Parser.new(raw)

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

List countries:

puts Metar::Station.countries

Find a country's weather stations:

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

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

See doc/metar_format.

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

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