http://swrc.ontoware.org/ontology#Article Balloon-borne cryogenic frost point hygrometer observations over Syowa Station, Antarctica en Water vapor Antarctic Stratosphere Regular balloon-borne cryogenic frostpoint hygrometer observations were conducted at Syowa Station, Antarctica, from 2013 to 2022 to monitor long-term variations in water vapor concentration in the upper troposphere and lower stratosphere over Antarctica. The data was screened and published in Ascii format for research purposes. This is the only regular balloon-borne hygrometer observation in the Antarctic region and is expected to be used for various purposes, such as climate change monitoring, research on water vapor transport processes, and validation of satellite observations. Polar Data Journal 9 44-52 2025-05 National Institute of Polar Research 2432-6771 https://doi.org/10.17592/001.2024122301|Original Data Atmospheric science/Climatology