The data are from multi-decadal hindcast simulation with the wave model WAM 4.5 covering the entire Baltic Sea using a grid size of about 5.5x5.5 km (0.05 degrees latitude x 0.10 degrees longitude). The hindcast covers the period 1958-2002. Integrated parameter derived from 2D spectra are available every hour; the wave spectra are available with a 3-hour time step. Atmospheric forcing was obtained from an atmospheric hindcast with SN-REMO (http://dx.doi.org/10.1594/WDCC/coastDat-1_SN-REMO) driven by the NCEP/NCAR Reanalysis 1 data set (Kalnay et al.,1996). Lateral boundary conditions were obtained from corresponding hindcast for the southern North Sea driven by the same atmospheric forcing (http://dx.doi.org/10.1594/WDCC/coastDat-1_Waves).