Ongoing climate change is the reason why more and more research is concerned with climate, its changes, rising temperatures, variability in total precipitation, or the effects of drought on forest ecosystems. The bachelor thesis deals with the monitoring of the influence of climatic and soil characteristics on changes in the circumference of trunks of three Norway spruce (Picea abies L. Karst) provenances originating from different altitudes (500, 750 and 1100 m above sea level) from the Volovské vrchy area. The research took place in one of the workplaces of the Technical University in Zvolen - in the Borová hora Arboretum (approx. 300 m above sea level, Zvolenská kotlina, central Slovakia). The research site does not represent optimal conditions for growth and development from an ecological or production point of view. Measurements took place from the beginning of April to the end of October in two climatically different years 2019 and 2020. The examined environmental factors were air temperature, global radiation, relative humidity, total precipitation, water saturation deficit and soil water potential. Changes in trunk circumference were measured using DRL 26 dendrometers. It is clear from the results that the influence of climatic characteristics on the trunk circumference is substantial especially the influence of precipitation and air temperature. In the period with precipitation, a significant growth and swelling of the strains is recorded, while in the precipitation-free period, the growth stagnated, or shrinkage has occurred. The year 2019 was generally warmer, but drier than 2020, so the increase for this year was smaller. The largest increase in both monitored periods was represented by provenance from an altitude of 1100 m above sea level.