Statistical and climatological analysis were submitted the long-term (the years 1962-2002) runs of monthly, half-year and annual average values of soil temperature measured at Wrocław-Swojec Agricultural Observatory. The changes of temperature on the deeps of 1-2 cm, 5 cm, 10 cm, 20 cm, 50 cm and 100 cm in a bare soil and under a grass field were regarded. The variability of thermo-isopleths of investigated soil points in relation to multiyear radiation and circulation dynamics were compared. In relation with solar radiation intensity beside global radiation two its main parts - direct and diffuse radiation were taken into consideration. The influence of circulation changes on soil temperatures, as well through reference to long-term variability of the NAO indexes and circulation macro-types (after Osuchowska-Klein classification and Nied�wied� typology) as and through relations with the chosen meteorological and hydrological derivatives of circulation - i.e. with air temperature, saturation deficit, precipitation, evaporation and level of ground water, which are controlling thermic relations in the ground, were investigated. The comparison of multiyear variability of bare soil temperatures with temperatures of grass field soil it was given possibility to observe a long-term, moderated role of biological factor in relation to occurred circulation and climatological changes.