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This study discusses the occurrence of days with unique thermal  characteristics for the period 1951–2000. The authors investigated longterm  variability, probability of occurrence and synoptic conditions favourable  to frosty (tmin≤0˚C ∧ tmax>0˚C), freezing (tmax<0˚C) and severe freezing  (tmax<-10˚C) days at six stations in the southern part of Poland. The occurrence  of frosty days is characterized by the highest diversity, both in spatial  and temporal terms and these days depend on the landform to the highest  degree. The number of freezing days ranged from 28–30 in the foothills of  the Carpathians to 147 at 2000 m a.s.l. in the Tatra Mountains, with severe  freezing days from ca. 2 to ca. 18 days respectively, though no distinct trends  were noted in their long-term progression. The anticyclonic situations and  air mass advection from the southern sector (frosty days), from the east,  south-east and north (freezing and severe freezing days) were the most favourable  for the days examined.

FROSTY, FREEZING AND SEVERE FREEZING DAYS AND THEIR SYNOPTIC IMPLICATIONS IN MAŁOPOLSKA, SOUTHERN POLAND, 1951–2000