Long-term time series of daily averaged potential temperature (ºC) and current speed (m/s) at 1000 m depth in the Cap de Creus submarine canyon in the northwestern Mediterranean. Data has been used to validate the MedSea regional reanalysis provided by the EU Copernicus Marine Service in the manuscript by Fos et al., submitted to GRL, Solving dense shelf water cascading with ocean reanalysis: the Northwestern Mediterranean case study.