If you mean historical forecast data, we do archive it but only for seven days at the time. There are quite a bit of information comparing different model perfo

If you mean historical forecast data, we do archive it but only for seven days at the time. There are quite a bit of information comparing different model performance that you can look up (i.e. https://apps.ecmwf.int/wmolcdnv/ https://apps.ecmwf.int/wmolcdnv/) on the other hand. In general, the European model (from ECMWF) is considered to ahead of other agencies' models in terms of performance.