This dataset includes tree ring width data, derived from tree cores, that were sampled from sites across the Rhön Biosphere Reserve (Germany). At each chosen site three trees were cored, with two or three cores taken per cored tree. Data was collected in August 2021. Full details about this dataset can be found at https://doi.org/10.5285/8d6effc3-54f2-4770-ac34-63320eb9e4e2
