Data relating to manuscript: "A low-cost post-processing technique improves weather forecasts around the world" by T. D. Hewson and F. M. Pillosu, prepared for Communications Earth and Environment (2021). DOI is cited in the paper's data availability statement. List below references the manuscript's content (e.g. Figure numbers). Repository Contents: SouthWalesCaseMay2020.tar (ref: Fig 1c) Image showing sequence of 12h rainfall1 forecasts for 06-18UTC 9th May 2020 (see annotation on Figure) VerificationFigure.tar (ref: Fig. 2) ROC curve data points and ROC area calculation Additional Verification Scores (e.g. different domains) CreteCaseFeb2019.tar (ref: Fig. 3) Grib files for ECMWF raw ensemble rainfall1 forecasts, rainfall values, 12-hour accumulations, valid time 12-24UTC 25 Feb 2019 (RawEnsTP_[Acc]_[BaseDate]_[BaseTime]_[EndStep].grib) Grib files for ecPoint-Rainfall1 forecasts, percentiles, 12-hour accumulations, valid time 12-24UTC 25 Feb 2019 (Pt_BC_PERC_[Acc]_[BaseDate]_[BaseTime]_[EndStep].grib) Crete rainfall observations, 24-hour accumulations, 00-24UTC, for Feb 2019, obtained from Hellenic National Met Service web site (ASCII)* Quality controlled composited version of *, for 25 Feb 2019 (Excel) NorwayCaseJan2018.tar (Fig. 4) Grib file for ECMWF raw ensemble rainfall1 forecasts, rainfall values, 12-hour accumulations, valid time 06-18UTC 25 Jan 2018 (RawEnsTP_[Acc]_[BaseDate]_[BaseTime]_[EndStep].grib) Grib file for ecPoint-Rainfall1 forecasts, percentiles, 12-hour accumulations, valid time 06-18UTC 25 Jan 2018 (Pt_BC_PERC_[Acc]_[BaseDate]_[BaseTime]_[EndStep].grib) Norway station location list from Norwegian Met Service (ASCII) 12h rainfall observations for 24th - 28th Jan 2018 from Norwegian Met Service (ASCII) Plot of radar-derived totals and rainfall observations for southwest Norway, for 06-18UTC 25 Jan 2018 (png) USACaseJul2020.tar (Fig. 7) "Gridbox weather types" diagnosed from ECMWF ensemble forecasts from 30th July 2020, valid for 12-24 UTC 30th July 2020 (WT_[Acc]_[BaseDate]_[BaseTime]_[EndStep].grib) 1 "Rainfall" means total precipitation (all phases).