The SeaDataCloud Temperature and Salinity seasonal climatologies have been processed from the historical Data Collection of the Arctic Ocean (from 56°N to 83°N and from 45°W to 70°E) including temperature and salinity in situ data of the water column  for the period 1955 -2019. Seasonal climatological fields are provided for the whole time period 1955-2019, six decades (1955-1964/1965-1974/1975-1984/1985-1994/1995-2004/2005-2014) and a pentad 2015-2019. A subset of the World Ocean Database 2018 (WOD18, https://www.nodc.noaa.gov/OC5/WOD/pr_wod.html) dataset has been integrated as external data-source to improve data availability for analysis. The climatology has been computed with DIVAnd software, version 2.6.6.