pvlib.iotools.get_pvgis_tmy(latitude, longitude, outputformat='json', usehorizon=True, userhorizon=None, startyear=None, endyear=None, map_variables=True, url='https://re.jrc.ec.europa.eu/api/', timeout=30)[source]#

Get TMY data from PVGIS.

For more information see the PVGIS 1 TMY tool documentation 2.

  • latitude (float) – Latitude in degrees north

  • longitude (float) – Longitude in degrees east

  • outputformat (str, default 'json') – Must be in ['csv', 'basic', 'epw', 'json']. See PVGIS TMY tool documentation 2 for more info.

  • usehorizon (bool, default True) – include effects of horizon

  • userhorizon (list of float, optional) – Optional user-specified elevation of horizon in degrees, at equally spaced azimuth clockwise from north. If not specified, PVGIS will calculate the horizon 3. If specified, requires usehorizon=True.

  • startyear (int, optional) – first year to calculate TMY

  • endyear (int, optional) – last year to calculate TMY, must be at least 10 years from first year

  • map_variables (bool, default True) – When true, renames columns of the Dataframe to pvlib variable names where applicable. See variable VARIABLE_MAP.

  • url (str, default: pvlib.iotools.pvgis.URL) – base url of PVGIS API, append tmy to get TMY endpoint

  • timeout (int, default 30) – time in seconds to wait for server response before timeout


  • data (pandas.DataFrame) – the weather data

  • months_selected (list) – TMY year for each month, None for basic and EPW

  • inputs (dict) – the inputs, None for basic and EPW

  • metadata (list or dict) – file metadata, None for basic


The PVGIS website uses 10 years of data to generate the TMY, whereas the API accessed by this function defaults to using all available years. This means that the TMY returned by this function may not be identical to the one generated by the website. To replicate the website requests, specify the corresponding 10 year period using startyear and endyear. Specifying endyear also avoids the TMY changing when new data becomes available.


requests.HTTPError – if the request response status is HTTP/1.1 400 BAD REQUEST, then the error message in the response will be raised as an exception, otherwise raise whatever HTTP/1.1 error occurred

See also








PVGIS horizon profile tool