In order to identify and describe the synoptic conditions which produced the waves of cold in the Prahova Corridor, the absolute minimum air temperatures in the cold semester of the year were analysed for the period 1961-2007 with homogenous data of the temperature values recorded at the Câmpina, Sinaia 1500, Predeal, Vârfu Omu şi Braşov stations. Based on these values, the negative termic singularities were determined and characterised as such type of climate hazard appears more evident in case of absolute minimum temperatures and the results obtained were synthetised in tabels and graphs. For illustratying these synoptic conditions that triggered the absolute minimum values of air temperatures the synoptic maps found in the Karten Archive of the Karlsruhe Meteorological Centre (Germany) have been resorted to. Considering the particular importance of this parameter, eventually we found useful also the computation of probability of occurence of values higher than those recorded during the refence period 1961-2007.