Basing on daily series of maximum air temperature values the during summer half year (from the beginning of May until the end of October) from the period of 1961-2007, an appraisal of the trends of the numbers of days with maximum temperature in set ranges of 1.0oC (from 0.1 to 40.0oC) in Wroclaw-Swojec was made. Identical analyses were also carried out for the multi-year period of 1971-2000 which is regarded as the norm. Increasing trends of the highest values of maximum air temperature were observed for May in the course of the years 1961-2007, what was not found in the case of the multi-year period of 1971-2000. A noticeable increase in extremes temperatures of May was noted for the last decade. Statistically significant trends of the highest values for June and October for the 1971-2000 period were not observed for the 1961-2007 sequence. Analyses carried out on 46-years sequences showed an increase in the frequency of occurrence of maximum air temperature values in May in ranges of 24.1-25.0oC, 25.1-26.0oC and 30.0-310oC, in July in ranges of 23.1-24.0oC, 33.1-34.0oC and 34.1-35.0oC, in August in ranges of 27.1-28.0oC and 29.1-30.0oC.