Studying the climatic conditions of the Bieszczady Mts. is difficult due to the lack of meteorological stations on top of mountain ridges and in the upper parts of slopes. In order to determine the value of particular meteorological elements in the upper parts of the Bieszczady, long-term continuous measurements are needed. Examples of climatic differentiation have been presented on the basis of studies carried out within relatively short time intervals. Topoclimatic measurements were done on top of the Połonina Wetlinska ridge, Mt. Tarnica and in the area of Równia near Ustrzyki Dolne. Many cases of temperature inversion have been documented. Among others, the possibility of ground frosts in the middle of the vegetation season has been noted in the highest parts of the Bieszczady. Measurements of the differentiation of the occurrence of snow cover have also been carried out. The height of particular vertical climatic zones in the Bieszczady has been estimated. It may be supposed that particular zones of that kind occur at the following heights· moderately warm zone – includes the areas below 650 m a.s.l. over convex relief forms and below 520 m a.s.l. over concave forms; moderately cool zone- the height of 650-1075 m a.s .l. (convex forms) and 520-850 m a. s.l. (concave forms); cool zone-above 1075 m a.s.l. (convex forms) and above 850 m a.s.l. (concave forms). In the middle of the tourist season, on top of uncovered ridges of the Bieszczady, there may occur conditions conducive to an intensive cooling of the human body (during the studies carried out normal effective temperature was known to drop to even minus 11.0°).