This dataset is used to showcase in Jupyter notebooks the usage of the Pythie postprocessing software available on GitHub. We use the ERA5 reanalysis over a large area in Europe from 1997 to 2016 as gridded observations. These reanalysis have been downloaded from the Copernicus Data Store in GRIB format and converted to the NetCDF file format. The reforecasts files have been download from ECMWF and converted to NetCDF files. The observation data of the WMO-compliant DWD meteorological station of Soltau from 1997 to 2016. The station is located at the point 52°57'37.5"N, 9°47'35.0"E. The data have been downloaded from the DWD Climate Data Center. Gridded reforecast data source Source www.ecmwf.int Creative Commons Attribution 4.0 International (CC BY 4.0) Copyright © 2021 European Centre for Medium-Range Weather Forecasts (ECMWF). Copernicus ERA5 gridded reanalysis data source Source https://cds.climate.copernicus.eu/ Copyright © 2021 European Union. Generated using Copernicus Climate Change Service information 2021. Hersbach et al. (2018): ERA5 hourly data on single levels from 1979 to present. Copernicus Climate Change Service (C3S) Climate Data Store (CDS). (Accessed on < 21-04-2021 >), doi:10.24381/cds.adbb2d47. Observation data source Source: Deutscher Wetterdienst, DWD CDC portal