The present paper aimed to render the correlation between the climatic conditions and forest vegetation within the Subcarpathian area, based on specific bioclimatic indices. In order to emphasize this correlation, there were analysed the spatial distribution and temporal variability of three indices – “De Martonne” aridity index (Ia), Ellenberg Quotient (EQ) and the forestry aridity index (FAI). The average monthly and annual temperature and precipitation data cover a period of 58 years (1961-2018). Based on the average values of the three indices it resulted that the central and eastern parts of the study area, with lower altitudes, is more suitable for the development of thermophilic species (oak, but also other deciduous species), while the western part, as well as at higher altitudes, beech (Fagus silvatica) and even coniferous species find proper conditions. The results indicate a good correlation among different bioclimatic indexes and between bioclimatic indexes and CLC 2018 classes of vegetation cover. In terms of temporal evolution, there Were not identified any statistically significant trends for the analyzed indices, mainly due to the fact that temperature increase in the area was also accompanied by the increase of the precipitation amount.