Along with the national legislative requirements in the biodiversity protection field on the territory of the Republic of Moldova, the natural heritage protection is achieved through the Emerald Network presence, which includes special conservation areas, representing the extension in non-EU countries of the European ecological network – “Natura 2000”. “Hâncesti Forest” Emerald site contains the vegetative associations of oak species and is situated in close distance to Hincesti town, Sarata Mereseni and Mereseni settlements (central part of country). Climate change is associated with many and complex adverse effects on environmental components, including forest ecosystems. Climate ecometric indices are calculation formulas for climate favorability, taking into account the actual values of the main climatic factors. Among the eco-climatic indices are, also, the Forest Aridity Index (FAI) and the Forest Aridity Stress Index (FASI). The calculation of the FAI included climatic parameters, temperature and average monthly precipitation, specific to the current year's growing season, with special emphasis on the so-called "critical months" (July-August) in the development of forest species from the temperate zone (Fuhrer E., et al 2011 ). High FAI values indicate that during the growing season and critical period for forest species, meteorological parameters show drier and drier development conditions and the lower FAI values - wetter and warmer climatic conditions. It was found that FAI value varies throughout the study area, between 5.79 - 8.07 units, which is explained by the adjacent parameters with influences on climate (landforms, slopes, exposure, etc.). According to the FAI reference values, favorable for the growth and development of different species (Beech ˂ 4.75; Oak with hornbeam 4.75 - 6.00; Sessile oak 6.00 - 7.25; Steppe forests ˃ 7.25), the climatic conditions in the perimeter of the Emerald Site "Hâncești Forest”, indicates territories for the growth and development of species characteristic for forest-steppe areas, and steppes. The vital processes of the forest are influenced by evapo-perspiration and the relative humidity of the air, especially in the growing months (May-August), when the water regime induces a decisive impact on the forests vitality, which is in most cases - deficient. In this context, a regional index has been developed, which reflects the real impact of climate aridity on the functionality of forest ecosystems – FASI (Nedealcov M., 2020). The high values of FASI during the tree growth period indicate that arid / stressful conditions may occur for forest ecosystems, which induce the triggering of risks associated with climate change: vegetation fires, spread of pests, defoliation, discoloration, etc. FASI values, calculated for Emerald Site “Hâncești Forest”, vary between 1.07 - 2.33 units. These values characterize the normal or relatively arid climatic conditions for the forestry sector during the growing period (May - August), but taking into account the values obtained in a multiannual aspect, where it is observed that in the last decades (2000-2019) arid stress conditions appear everywhere (and several risks associated with climate aridity - droughts, fires, pest invasions, etc., also). The study results are of particular interest in the sustainable management of the national forestry sector.