Atmospheric variables needed to force terrestrial process models (permafrost, glacier mass balance, seasonal snow, surface energy balance), have been downscaled from the ERA 40 and ERA interim re-analyses using methodology described in the accompanying paper. The gridded dataset has a horizontal resolution of 1 km and covers the entire Svalbard archipelago. The data have a temporal resolution of 6h and cover the entire ERA40 period (1957-2002) and the ERAinterim period (1979-2016).