Search for: [Subject and Keywords = sub\-zero air temperature] OR [Subject and Keywords = start, end and and the length of winter] OR [Subject and Keywords = cluster analysis] OR [Subject and Keywords = trend] OR [Subject and Keywords = Geografia \-\- czasopisma \[KABA\]] OR [Subject and Keywords = Polska \-\- geografia \-\- czasopisma \[KABA\]] OR [Subject and Keywords = ujemna temperatura powietrza] OR [Subject and Keywords = początek, koniec i długość zimy] OR [Subject and Keywords = analiza skupień] OR [Subject and Keywords = trend] OR [Title = Regiony termicznej zimy w Polsce = Thermal\-winter regions in Poland] OR [Creator = Czarnecka, Małgorzata] OR [Creator = Nidzgorska\-Lencewicz, Jadwiga]