Assessing drought severity is an element of the drought monitoring. The assessment of severity and frequency of dry periods in a given severity class depends on the assumed criteria of drought. Using the series of precipitation records in the growing periods of 1954-1998 from 6 meteorological stations located in Wielkopolska and Kujawy, the relative precipitation index RPI and the standardized precipitation index SPI have been calculated. In view of the lack of statistically significant differences in mean precipitation between selected stations, it has been assumed that the region is homogenous in that aspect. According to RPI and the Kaczorowska's criteria, dry months constituted 40 % of the growing periods. According to SPI, dry months amounted only 15 %. In the paper the values of both indices and their correlations are analysed. The reasons of significant differences in the frequency of occurrence of dry months are indicated. The indices are evaluated with regard to their applicability for drought monitoring.
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