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This paper aims at presenting changes in everyday air temperature values, triggered by the contemporary warming process. The analysis has been based on the mean, maximum, and minimum daily temperature values measured in Warsaw between 1951 – 2003. The mean daily temperature in that period was between −24.6 and 28.4°C, absolute minimum temperature was −30.7°C, absolute maximum temperature amounted to 36.4°C. Calculations indicate that the number of days with mean temperature ≤ −5.0°C (minimum   20.0°C and maximum temperature &gt; 25.0°C was growing, particularly in the 1990’s and even more so in early 2000’s. Also since 1990’s, there has been increasingly more nights with minimum temperature &gt; 15.0°C, which has been particularly apparent in 2001. Contemporary warming is then marked with an increasing frequency of the hottest days and decreasing frequency of the coldest days. These changes were asymmetrical beyond 1950’s, yet, in late 1990’s they coincided.

Contemporary Warming and Daily Values of Temperature (on the Example of Warsaw)