The main objective of the present study was the examination and thequantification of the uncertainties in the precipitation time series overthe Greek area, for a 42-year time period. The uncertainty index applied tothe rainfall data is a combination (total) of the departures of the rainfallseason length, of the median data of the accumulated percentages and of thetotal amounts of rainfall. Results of the study indicated that all thestations are characterized, on an average basis, by medium to highuncertainty. The stations that presented an increasing rainfall uncertaintywere the ones located mainly to the continental parts of the study region.From the temporal analysis of the uncertainty index, it was demonstratedthat the greatest percentage of the years, for all the stations time-series,was characterized by low to high uncertainty (intermediate categories of theindex). Most of the results of the uncertainty index for the Greek regionare similar to the corresponding results of various stations all over theEuropean region.
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