EN
The principal goal of the study was to determine circulation types with respect to the occurrence of extreme values of air temperature in Poland. A comparison between different available classifications was also performed. Maximum and minimum daily temperatures for the 56-year study period (1951-2006) obtained from 54 weather stations were used. Detailed calculations were performed for the summer (June-August) and winter (December-February) seasons. Extreme values were selected with respect to probability distribution bases. The study showed that circulation types with an anticyclonic ridge were the most important for extremely hot days in the summer, while extremely low temperatures in the winter were usually associated with anticyclonic types with an easterly airflow. A special effort was made to identify the classification scheme yielding the best accuracy in evaluating extremes.