The Palmer Drought Severity Index (PDSI) for the summer time over the 1891-1991 interval as it was calculated by Briffa et al. [ Int. J. Climatol 14 (1994) 475-506] is considered. PDSI is analysed in this paper for six regions. As we expected the NAO signal is evident in wintertime, but its influence is not simultaneous in the same month--but with some lags. For instance, the best significant NAO signal has been obtained by considering the NAO in January as predictor and the drought index in Romania in January-March as predictand. For this pair the highest signal-to-noise ratio has been obtained. The following result is related to the influence of NAO in January on the precipitation behaviour in February-April. The other results emphasised PDSI responses at the NAO signal in the cold half of the year with several lag months delay.