The bachelor thesis deals with the growth processes, especially stem´s circumference changes of trees (Norway spruce and Silver fir) and their relationship to climatic factors. Climatic factors such as air temperature, precipitation, relative air humidity, global radiation and water saturation deficit were evaluated. The research took place on two plots, for each tree species separately in the Botanical garden called Borová hora (350 m above sea level, 2nd forest stage), which is part of the Technical University in Zvolen. Stem radius was monitored continuously using dendrometers DRL 26 with automatic data storage. Measurements were made between 1. March and 31. October in 2017 and 2018. The air temperature and precipitation have a significant impact on the change in stem circuitry. The diameter increment increased in proportion to the rising air temperature, but only to the extent that the trees were adequately supplied with water. In the case of a collision- free period, the strain was shrunk. In the daytime, a more pronounced shrinkage during the collision- free period was recorded in spruce wood. The fir responded less sensitively to changes in water availability. Overall, 2018 was warmer and drier compared to 2017, with longer periods without precipitation. This is evidenced by the diameter increments on both of monitored species trees. When we compare spruce and fir increment in 2017, we see on average 30 % more value than in 2018. The increment of fir was 61,3 % larger in 2017 than spruce.