15 Monitoring of Small Catchments in …
355
Fig. 15.6 Mean annual course of selected climate elements at Koniczynka, 1994–2017
and 2014 turned out to be very warm. In the analysed period, hot and very hot days
showed a growing trend, whereas frost days, cold and freezing cold days occurred
less frequently. The identified trends are not statistically significant.
In the annual course in 1994–2017, the lowest mean air temperature occurred
in January (−1.7 °C), but the other winter months (December and February) also
had negative mean values. The highest mean temperature in the annual course was
observed in July (19.1 °C) (Fig. 15.6).
The relative humidity of air is an important parameter indicating the saturation
of air with water vapour. In Poland, its standard values range from approx. 78%
in the west part of the country (Pozna´ n and Zielona Góra) to 87% at the top of
Mount ´
Snie˙ zka (1951–1980) [25]. In comparison, the area of the Koniczynka station
is dry, as the mean relative humidity in 1994–2017 was 79% there. In the annual