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Observing the beginning and duration of different stages of the development of plants, we can determine, the influence of individual climatic factors on their growth and development. Analysing the process of sprouting, browsing and leafing of six individual birch trees, we determined which factors affect the development of buds and leaves. Birch trees, the dominant tree species in our area, were analysed at five different locations. We have evaluated the thermal conditions for this year for the observed trees, comparing their age and the position on which the amount of sun radiation is dependent. Air temperature and rainfall are the most important factors affecting the growth of plants. Although our observed trees are geographically rather close, the difference in the dates of the opening of the buds of the first and last propagated breeds was 14 days. We tried to explain the cause of the differences, with their different position in relation to the sun and their age. We have also concluded that the structure of the soil, is the factor that affects plants growth. By comparing the air temperature, surface temperature of the soil and the temperature of the list, we showed their linear dependence.