The SeaDataCloud Temperature and Salinity Historical Data Collection for the Arctic Ocean V2 include open access in situ temperature and salinity data for the time period 1900-2019. The data were retrieved from the SeaDataNet infrastructure at the end of July 2019. The dataset format is ODV binary collections. The quality control of the data has been performed with the help of ODV software. Data Quality Flags have been revised following common recommended procedures defined under SeaDataNet 2 project in conjunction with visual expert check.