As part of the Long Term Ecological Research (LTER) project in the McMurdo Dry Valleys of Antarctica, a systematic sampling program has been undertaken to monitor the glacial meltwater streams in that region. This package contains daily summaries derived from 15-minute measurements of water quality and quantity parameters measured with automatic recording devices on streams in this region. Specifically, this metadata record describes the daily hydrological summaries for the McMurdo Dry Valley's Lost Seal Stream at F3, located in the Fryxell Basin of Taylor Valley. Measurements commenced during the 1990-91 season and are ongoing. This dataset extends through the first half of the 2022-23 field season.