EM Snow combines open data from the services below. We are grateful to every one of them.
Weather data by Open-Meteo.com
Licence: Data CC BY 4.0; free hosted API is non-commercial · https://open-meteo.com/
Weather data by Open-Meteo.com
Licence: Data CC BY 4.0 (s3://openmeteo, AWS Open Data); server AGPLv3 (run stock, no modifications) · https://github.com/open-meteo/open-data
ERA5 and ERA5-Land data distributed by Open-Meteo under CC BY 4.0
Licence: CC BY 4.0 · https://github.com/open-meteo/open-data
Météo-France, AROME and ARPEGE model data via meteo.data.gouv.fr, Licence Ouverte 2.0, forecast runs updated continuously
Licence: Licence Ouverte v2.0 (Etalab): commercial use and redistribution with attribution · https://meteo.data.gouv.fr/
Based on data and products of the European Centre for Medium-Range Weather Forecasts (ECMWF)
Licence: CC BY 4.0 plus ECMWF Terms of Use (attribution wording prescribed, removable on ECMWF request) · https://www.ecmwf.int/en/forecasts/datasets/open-data
Contains modified Copernicus Climate Change Service information (ERA5)
Licence: CC BY 4.0 (CDS licence change 2025-07-02) · https://open-meteo.com/en/docs/historical-weather-api
Contains modified Copernicus Climate Change Service information [2026]. Neither the European Commission nor ECMWF is responsible for any use that may be made of the Copernicus information or data it contains.
Licence: CC-BY (CDS dataset page, read 2026-09-15; dataset update date 2026-09-15). DOI 10.24381/cds.e2161bac · https://cds.climate.copernicus.eu/datasets/reanalysis-era5-land
Contains modified Copernicus Climate Change Service information [2026]. Neither the European Commission nor ECMWF is responsible for any use that may be made of the Copernicus information or data it contains.
Licence: CC-BY (CDS dataset page). DOI 10.24381/cds.adbb2d47 · https://cds.climate.copernicus.eu/datasets/reanalysis-era5-single-levels
Map data (c) OpenStreetMap contributors, via OpenSkiMap.org
Licence: ODbL 1.0 · https://openskimap.org/
Structured data from Wikidata
Licence: CC0 1.0 Universal (Public Domain Dedication) · https://www.wikidata.org/
Copyright (c) 1991-present Unicode, Inc. Unihan kMandarin readings, unicode.org/copyright.html
Licence: Unicode License v3 (Data Files and Software) · https://www.unicode.org/reports/tr38/
WSL Institute for Snow and Avalanche Research SLF
Licence: SLF public measurement API · https://www.slf.ch/
GeoSphere Austria
Licence: CC BY 4.0 · https://www.geosphere.at/
Météo-France réseau nivo-météorologique
Licence: Licence Ouverte 2.0 · https://meteofrance.com/
USDA NRCS SNOTEL
Licence: US public domain · https://www.nrcs.usda.gov/
NVE (seNorge/gts.nve.no)
Licence: NVE open data · https://www.nve.no/
SMHI öppna data
Licence: CC BY 4.0 · https://www.smhi.se/
BC Automated Snow Weather Stations (gov.bc.ca)
Licence: BC Open Government Licence · https://www.gov.bc.ca/
Snowy Hydro Ltd snow courses
Licence: Snowy Hydro public data · https://www.snowyhydro.com.au/
Japan Meteorological Agency (AMeDAS)
Licence: JMA open data · https://www.jma.go.jp/
Agencija RS za okolje (ARSO)
Licence: ARSO public data · https://www.arso.gov.si/
Czech Hydrometeorological Institute (ČHMÚ), opendata.chmi.cz
Licence: CC BY 4.0 · https://opendata.chmi.cz/
European Avalanche Warning Services (EAWS) member agencies
Licence: CC BY family (per-member country, see eaws.org) · https://www.avalanches.org/
Avalanche forecast: Avalanche Canada (avalanche.ca)
Licence: Written permission from Avalanche Canada (obtained by Lee, 2026-09-27) · https://avalanche.ca/
Avalanche danger from the issuing avalanche centre via avalanche.org (National Avalanche Center)
Licence: Provider terms; no open-data licence recorded · https://avalanche.org/
Webcams provided by windy.com - add new webcam
Licence: Windy Webcams API v3 terms of use (account.windy.com/agreements/windy-api-webcams-terms-of-use) · https://www.windy.com/
Ratings data via Foursquare
Licence: Foursquare Places API terms · https://location.foursquare.com/
Lift status courtesy of the named resort operators
Licence: Per-operator; see perFeed triage
Source: Federal Office of Topography swisstopo
Licence: swisstopo open government data, free of charge including commercial use, source reference required · https://www.swisstopo.admin.ch/en/height-model-swissalti3d
IGN, MNT LiDAR HD, Licence Ouverte 2.0; dataset update date recorded per clip in the DEM manifest Source dataset last updated 2025-05-01.
Licence: Licence Ouverte / Open Licence 2.0 (etalab), commercial use permitted with attribution · https://geoservices.ign.fr/lidarhd
Digitales Gelaendemodell (DTM) Oesterreich, BEV, CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/), clipped and resampled for per-resort use Source dataset last updated 2025-09-15.
Licence: CC BY 4.0 · https://data.bev.gv.at/geonetwork/srv/api/records/9a4e3e4f-2cd5-4f73-af51-384beb9331d0
Sourced from LINZ, CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/), clipped and resampled for per-resort use Source dataset last updated 2025-06-29.
Licence: CC BY 4.0 · https://www.linz.govt.nz/products-services/data/types-linz-data/elevation-data
© State of New South Wales (Spatial Services, DCS), CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/), clipped and resampled for per-resort use
Licence: CC BY 4.0 · https://www.spatial.nsw.gov.au/
Elevation data courtesy of the U.S. Geological Survey (3DEP / The National Map), public domain
Licence: Public Domain · https://www.usgs.gov/3d-elevation-program
© Czech Office for Surveying, Mapping and Cadastre (CUZK), DMR 5G, CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/), clipped and resampled for per-resort use
Licence: CC BY 4.0 · https://geoportal.cuzk.cz/
© Kartverket (hoydedata.no), National Height Model (NHM DTM), Norwegian Licence for Open Government Data (NLOD 2.0), clipped and resampled for per-resort use
Licence: NLOD 2.0 / CC BY 4.0 · https://hoydedata.no/
Contains information licensed under the Open Government Licence – Canada, © Natural Resources Canada
Licence: Open Government Licence - Canada · https://open.canada.ca/en/open-government-licence-canada
Elevation data: Geospatial Information Authority of Japan (Kokudo Chiriin), https://maps.gsi.go.jp/development/ichiran.html
Licence: GSI Content Usage Terms, base survey result (kihon sokuryo seika); real-time load via web/app requires attribution only, no application · https://www.gsi.go.jp/kikakuchousei/kikakuchousei40182.html
Produced using Copernicus WorldDEM-30 © DLR e.V. 2010-2014 and © Airbus Defence and Space GmbH 2014-2018 provided under COPERNICUS by the European Union and ESA; all rights reserved. The organisations in charge of the Copernicus programme by law or by delegation do not incur any liability for any use of the Copernicus WorldDEM-30
Licence: Free for any use including commercial, subject to the Copernicus DEM licence notice · https://registry.opendata.aws/copernicus-dem/
Generated using Copernicus Atmosphere Monitoring Service information; distributed via Open-Meteo self-hosted sync (CC BY 4.0 redistribution)
Licence: Copernicus free and open data policy (Regulation (EU) No 1159/2013): worldwide, royalty-free reuse including commercial, attribution required · https://atmosphere.copernicus.eu/
Data obtained from the Global Wind Atlas version 4.0, a free, web-based application developed, owned and operated by the Technical University of Denmark (DTU). The Global Wind Atlas version 4.0 is released in partnership with the World Bank Group, utilizing data provided by Vortex, using funding provided by the Energy Sector Management Assistance Program (ESMAP). For additional information: https://globalwindatlas.info | Citation: Davis, N.N., Badger, J., Hahmann, A.N. et al. (2023), The Global Wind Atlas: A high-resolution dataset of climatologies and associated web-based application, Bulletin of the American Meteorological Society 104(8): E1507-E1525, DOI: https://doi.org/10.1175/BAMS-D-21-0075.1
Licence: CC BY 4.0 (modified: clipped to resort areas and aggregated along lift geometry) · https://globalwindatlas.info
© ESA WorldCover project 2021 / Contains modified Copernicus Sentinel data (2021), processed by ESA WorldCover consortium
Licence: CC BY 4.0 (modified: zonal aggregation along piste corridors) · https://esa-worldcover.org
Imagery © Esri, Maxar, Earthstar Geographics (rendered on-map on the resortinfo sun map and /flyby satellite bases)
Licence: Esri Master Agreement via ArcGIS Location Platform keyed API (free tier: 2,000,000 basemap tiles/month, then $0.15/1k) · https://location.arcgis.com/
Sentinel-2 cloudless 2025 by EOX (rendered on-map when active), modified Copernicus Sentinel data
Licence: CC BY-NC-SA 4.0 (EOX::Maps free tier - NON-COMMERCIAL) · https://maps.eox.at/
©swisstopo
Licence: swisstopo open government data, free of charge including commercial use, source reference required · https://www.swisstopo.admin.ch/en/terms-of-use-free-geodata-and-geoservices
Datenquelle: basemap.at
Licence: Open Government Data Oesterreich, CC BY 4.0 · https://basemap.at/
IGN
Licence: Licence Ouverte / Open Licence 2.0 (Etalab) · https://geoservices.ign.fr/cgu-licences
NOAA Climate Prediction Center
Licence: US Government work, public domain · https://www.cpc.ncep.noaa.gov/data/indices/oni.ascii.txt
NOAA Climate Prediction Center
Licence: US Government work, public domain · https://www.cpc.ncep.noaa.gov/products/precip/CWlink/pna/norm.nao.monthly.b5001.current.ascii.table
Contains information from the OpenHolidaysAPI holiday database (https://github.com/openpotato/openholidaysapi.data), which is made available under the Open Database License (ODbL) 1.0, https://opendatacommons.org/licenses/odbl/1-0/
Licence: ODC Open Database License (ODbL) 1.0 — https://opendatacommons.org/licenses/odbl/1-0/ · https://github.com/openpotato/openholidaysapi.data
Contains public sector information licensed under the Open Government Licence v3.0
Licence: Open Government Licence v3.0 — https://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/ · https://www.gov.uk/bank-holidays.json
School calendars for Great Britain, Denmark and Sweden compiled by Extreme Media Snow from published government, local-authority and municipal term dates; approximate
Licence: Compiled by Extreme Media Snow from the public sources cited per country in data/crowd-curated-holidays.json · https://snow.extreme-media.co.uk/attribution
Source: Eurostat, tour_occ_nim, tour_occ_ninraw, tour_occ_nin2, data adapted by Extreme Media Snow. Eurostat is not responsible for any use made of this adaptation.
Licence: Commission Decision 2011/833/EU: reuse for commercial and non-commercial purposes authorised provided the source is acknowledged · https://ec.europa.eu/eurostat/web/main/help/copyright-notice
Resort season dates and snow reports via OnTheSnow
Licence: Proprietary, no public licence. Undocumented public JSON endpoint (api.onthesnow.com/api/v2) serving the operator of the onthesnow.com site. · https://www.onthesnow.com/
Registry version 1, updated 2026-09-26.