Zmiany wieloletnie liczby termicznych dni charakterystycznych w Warszawie (1951 – 2010)
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Multiannual variation of thermal specific days in Warsaw (1951 – 2010)The paper focuses on the frequency, annual pattern and long-term variability of thermal specific days in Warsaw during the period 1951 – 2010. The following were distinguished: days with frost ( tmax ≥ 0.0 °C, tmin < 0.0 °C ), cold days ( tmax –0.1 – –10.0°C ), very cold days ( tmax – 10.1– – 20.0 °C ), extremely cold days ( tmax < –20.0°C ), hot days ( tmax 25.1–30.0 °C ), very hot days ( tmax 30.1–35.0 °C ) and extremely hot days ( t max > 35.0 °C ) as well as warm nights ( t min 15.1 – 18.0 °C ), very warm nights ( t min 18.1 – 20.0 °C ) and tropical nights ( t min > 20.0 °C ). The following average numbers of days/nights per year were found during the period 1951 – 2010: 109 days with t min < 0.0°C, including 37 days with t max < 0.0°C, 38 days with tmax > 25°C, and 21 nights with t min > 15.0 °C. The minimum temperature ranged from –30.7 °C to 21.8 °C and the maximum temperature from –20.4 °C to 36.4 °C. The number of days with tmax ≥ 0.0 °C and tmin < 0.0 °C dropped by 1.8 day/10 years, days with t max < 0.0 °C also by 1.8 day / 10 years; the number of days with t max > 25.0 °C rose by 2.2 day / 10 years, while the number of days with t min > 15.0 °C rose by 2.4 day / 10 years. The results are based the on data collected at the Okęcie airport station, which is located outside the town and therefore they are not representative of the Warsaw urban area, but rather of the eastern part of the Warsaw basin.
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