The objective of the present work is to present the temporal and spatial characteristics of the bioclimatic conditions ofthe Lubuskie Voivodeship. The daily timed values (12UTC) of meteorological elements in the period 1971-2006 from threestations (Słubice, Gorzów Wielkopolski and Zielona Góra) were used as the basis for the calculations. In order to assessthe bioclimatic conditions, a thermal stress index UTCI (Universal Thermal Climate Index) that is calculated with theuse of BioKlima 2.6 software was applied. The analysis shows that thermal stress related to ‘slight and moderate coldstress’ and ‘no thermal stress’ is a dominant factor (80%) affecting the bioclimatic conditions of the Lubuskie Voivodeship.During the analysed period, days with thermal stress related to cold stress occurred more frequently than thosewith thermal stress related to heat stress. On the basis of a linear regression trend, a positive trend for thermoneutralconditions days and heat related stress days (UTCI>32°C), as well as a negative trend for cold related stress (UTCI<-13°),were ascertained.