This data set is related to the article ‘Tricentennial trends in spring ice break-ups on three rivers in Northern Europe’ which was published in The Cryosphere in 2022. The data set includes the ice-off dates (the first day the river is ice-free) for Aura River in Turku (60°45’N, 22°27’E) over the period 1749–2020 and the break-up (the date when the ice started breaking up and/or moving) dates for Kokemäki River in Pori (61°48’N, 21°79’E) over the period 1793–2020. Both rivers are in Finland. The data set has been developed for climate research purposes. The aim was to create two series with homogenized break-up dates with regard to site and event. The series will be updated if new observations are obtained. See the Readme_txt for more information about the data sets.

Fonden till Hedvigs Minne (grant fund held in trust by the Åbo Akademi University Foundation).