Extreme percentiles (1%, 5%, 95%, 99%) of bottom temperature and salinity, as well as (95%, 99%) of bottom currents, were modeled using SYMPHONIE on a numerical domain covering 65 × 60 km at a resolution of 80 m. The 10-m bathymetry used inside the Lacaze-Duthiers Canyon was collected during the CALADU_2021 cruise (https://doi.org/10.17600/18001575). Statistics of extreme values were derived from hourly fields simulated between November 1, 2012, and April 15, 2014. This period includes two contrasting winters: the winter of 2012–2013, which was cold with dense water cascading, and the winter of 2013–2014, which was warm. This dataset was produced to assess the probable distribution of habitats (habitat suitability modeling) for cold-water corals in the Lacaze-Duthiers Canyon at different resolutions as part of the European H2020 project REDRESS (Restoration of Deep-Sea Habitats to Rebuild European Seas, https://redress-project.eu/, Grant Agreement No. 101135492). SYMPHONIE is a component of the national service SIROCCO (research infrastructure ILICO). This dataset is related to the article "Mapping and Conservation of Cold-Water Corals in the Lacaze-Duthiers Canyon for Transboundary Management", submitted to Mediterranean Marine Science by Fabri et al. in 2025.