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In this paper are analyzed the climatic and hydrological records from 29 meteorological stations and 48 hydrometric stations which are all overlapping on two big drainage basins (Siret and Prut) from the eastern part of Romania. To these registrations, were added information obtained on basis of more than 20 dendrochronological series collected from the entire surface of the two studied basins. In order to obtain the correlation between radial tree rings growth and climate, were used the climatic data from National Climatic Grid with spatial resolution of 10x10 km. The climatic information obtained on the analysis of dendrochronological series complete the data from the meteorological stations, especially if we consider the fact that some of the tree ages cover older periods than year 1900. Annual series of variables: temperature (T), precipitation (P), number of days from year with sunshine radiation (S) water …