LOW PRECIPITATION OVER GREECE DURING 1989-1990

The unusual low precipitation observed during 1989-1990 in Greece is the subject of the present study. Statistical comparisons of this drought period with other dry periods in the historical records, possible statistical cycles, (periodicities), or general trends, together with the behaviour of the long time series are investigated. Power spectra of the annual rainfall series are also plotted considering the 95 years of data for the most reliable station in Greece. Furthermore, the drought persistence between successive months is also analysed using standard methods. The analysis identified periodicities of 2.1 and 3.6 years while no significant trends were observed in almost all cases. Finally the persistency of successive dry days was found to be insignificant after the fourth day