Ekstrema termiczne w Górach Świętokrzyskich na przełomie XX i XXI wieku
Thermal extremes in the Świętokrzyskie Mts (central Poland) at the turn of the 21st century

Summary/Abstract: The aim of this study was to determine the number of hot days, very hot days and very frosty days as well as heat waves and cold spells in the Świętokrzyskie Mts (central Poland) during the 1981 – 2013 period. Datasets of minimum and maximum daily air temperatures from the IMGW-PIB stations : Kielce-Suków, Bodzentyn and Święty Krzyż were used in the study. During the last 35 years 17 heat waves and 12 cold spells occurred in the study area. The number of hot and very hot days and heat waves on the summits of the Świętokrzyskie Mts ( Święty Krzyż weather station ) was 2 – 5 times lower than at the valley stations. There was an evident increase in the occurrence frequency of hot weather extremes in the 2001 – 2010 period as compared to the end of the past century. There is no clear tendency to change in the number of very frosty days and cold spells. Two indices: WSNC and WSNZ were proposed as tools for the assessment of the intensity of heat waves and cold spells.

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