Open‐Meteo (English)

What is Open-Meteo?

Open-Meteo is an open-source weather API, that can be used for free in non-commercial domain. It provides forecast and historical data from various weather services including NOAA, DWD, Meteofrance, MSC-CSC etc. No API key is required to use the service.

Using Open-Meteo API with WeeWX

weewx-DWD supports retrieving actual weather data from Open-Meteo by their API. Open-Meteo focusses on forecasts and historical data, but current data are also available.

Retrieving current weather data

Configuration

The configuration is simple. Specify latitude and longitude. The configuration section in weewx.conf could look like this:

[WeatherServices]
    [[current]]
        [[[FichtelbergOM]]]
            provider = Open-Meteo
            model = LIST_OF_WEATHER_MODELS
            latitude = 50.4283
            longitude = 12.9536
            altitude = 1213
            iconset = 4
            prefix = 'xyz'

This would retrieve current weather data for mount Fichtelberg in Saxony. You can specify any other location around the world.

Using in skins

The prefix is set to xyz in this example. This means, if you want to display the temperature you would write $current.xyzOutTemp in the skin template. $current.xyzIcon.raw provides an icon file name, and $current.xyzIcontitle.raw a text message describing the current weather.

Observation types (replace prefix by the prefix you set in configuration):

• prefixDateTime
• prefixOutTemp
• prefixWindSpeed
• prefixWindDir
• prefixWeathercode
• prefixIcon
• prefixIcontitle
• prefixLatitude
• prefixLongitude
• prefixAltitude

Forecast

To download forecast data und create forecasts a separate script is used which will be invoked from the command line.

For WeeWX packet installation:

dwd-mosmix --weewx --open-meteo=LIST_OF_WEATHER_MODELS --lang=LANGUAGE OUTPUTOPTIONS LATITUDE,LONGITUDE

For WeeWX pip installation:

dwd-mosmix --config=/path/to/your/weewx.conf --open-meteo=LIST_OF_WEATHER_MODELS --lang=LANGUAGE OUTPUTOPTIONS LATITUDE,LONGITUDE

OUTPUTOPTIONS can be any combination of the following options:

• --html --daily --hourly: create HTML include files containing the weather forecast as a table
• --database: create a database file containing the forecast data for displaying diagrams
• --belchertown: create a Belchertown format forecast.json file

Open-Meteo provides forecasts from several different weather services from around the world. Some of those weather services provide more than one weather model. To select the weather service and weather model to use set the option --open-meteo as follows:

--open-meteo=	Country	Weather service	Model
dwd-icon	DE	DWD	ICON
gfs	US	NOAA	GFS
meteofrance	FR	MeteoFrance	Arpege+Arome
ecmwf	EU	ECMWF	open IFS
jma	JP	JMA	GSM+MSM
metno	NO	MET Norway	Nordic
gem	CA	MSC-CMC	GEM+HRDPS
ecmwf_ifs04	EU	ECMWF	IFS
metno_nordic	NO	MET Norway	Nordic
icon_seamless	DE	DWD	ICON Seamless
icon_global	DE	DWD	ICON Global
icon_eu	DE	DWD	ICON EU
icon_d2	DE	DWD	ICON D2
gfs_seamless	US	NOAA	GFS Seamless
gfs_global	US	NOAA	GFS Global
gfs_hrrr	US	NOAA	GFS HRRR
gem_seamless	CA	MSC-CMC	GEM
gem_global	CA	MSC-CMC	GEM
gem_regional	CA	MSC-CMC	GEM
gem_hrdps_continental	CA	MSC-CMC	GEM-HRDPS
ukmo_seamless	GB	UK Met Office	UKMO Seamless

Use dwd-mosmix --help for a complete list of options.

To download the forecast automatically put the call to dwd-mosmix into /etc/crontab.