The Polar Science Center Hydrographic Climatology (PHC) is a new gridded ocean climatology that merges the 1998 World Ocean Atlas (WOA) with the Arctic Ocean Atlas (AOA). This merging process aims to create a global climatology for temperature and salinity that provides a high-quality description of the Arctic Ocean and its surroundings. The PHC includes monthly, seasonal, and annual average products, addressing the sparse and often classified nature of Arctic Ocean data. The authors describe the data preparation steps, including the modification of WOA and AOA datasets to ensure compatibility and the optimal interpolation procedure used to merge the datasets. The resulting PHC dataset is designed to serve as an updated and comprehensive resource for climate researchers, modelers, and validation purposes. The paper also discusses future plans for updating the PHC and acknowledges the contributions of various individuals and organizations.The Polar Science Center Hydrographic Climatology (PHC) is a new gridded ocean climatology that merges the 1998 World Ocean Atlas (WOA) with the Arctic Ocean Atlas (AOA). This merging process aims to create a global climatology for temperature and salinity that provides a high-quality description of the Arctic Ocean and its surroundings. The PHC includes monthly, seasonal, and annual average products, addressing the sparse and often classified nature of Arctic Ocean data. The authors describe the data preparation steps, including the modification of WOA and AOA datasets to ensure compatibility and the optimal interpolation procedure used to merge the datasets. The resulting PHC dataset is designed to serve as an updated and comprehensive resource for climate researchers, modelers, and validation purposes. The paper also discusses future plans for updating the PHC and acknowledges the contributions of various individuals and organizations.