Data Sources

The Dark Sky API is backed by a wide range of weather data sources, which are aggregated together to provide the most accurate forecast possible for a given location. Any data sources used to service a given request will be noted in the flags section of the API response.

Most of our sources focus on the USA and UK, and these areas are best supported by our API. We have plans to greatly improve our international forecasts in the near future.

Our sources include:

ID Source
cmc The USA NCEP’s Canadian Meteorological Center ensemble model, available globally.
darksky Dark Sky’s own hyperlocal precipitation forecasting system, backed by radar data from the USA NOAA’s NEXRAD system, available in the USA, and the UK Met Office’s NIMROD system, available in the UK and Ireland.
ecpa Environment and Climate Change Canada's Public Alert system, available in Canada.
gfs The USA NOAA’s Global Forecast System, available globally.
hrrr The USA NOAA’s High-Resolution Rapid Refresh Model, available in the continental USA.
isd The USA NOAA’s Integrated Surface Database, available near populated areas globally for times greater than two weeks in the past.
madis The USA NOAA/ESRL’s Meteorological Assimilation Data Ingest System, available near populated areas globally.
metwarn The UK Met Office’s Severe Weather Warning system, available in the UK.
nam The USA NOAA’s North American Mesoscale Model, available in North America.
nwspa The USA NOAA’s Public Alert system, available in the USA.
sref The USA NOAA/NCEP’s Short-Range Ensemble Forecast, available in North America.