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Precipitation in Poland in long-period Averages 109

for Podhale in sunspot cycles. An increased freąuency of excess of summer precipitation was revealed 1 year before and 1 year after a sunspot maximum, and 1 year after a sunspot minimum. An increased freąuency of deficiency of summer precipitation occurred 2 years before a sunspot minimum and 2 years before a sunspot maximum (Tables 14 and 15).

In the third part of the paper the author studied the differentiation in to-tal precipitation in Poland, and the probability of the occurrence of an excess or a deficiency of precipitation.

First, she analyzed in detail the individual series of total precipitation of 27 stations (Table 16). This investigation led to the differentiation of the following regions: the Pomeranian Lakę District, the Masurian Lakę District, Central and Western Poland, the Lublin Plateau, the Silesian Lowland, the Sudeten Foreland, the Kraków—Częstochowa Plateau, the Subcarpathian Lowland, the Western Beskides, the Sącz Beskides, the Podhale region (Fig. 8).

The annual and seasonal means of the amounts of precipitation for each of the regions mentioned above were investigated as to their probability and their degree of scattering (Table 17).

The author madę an attempt of estimating the real (,,true“) means of total precipitation per year and per its seasons, for each of the regions, in the confidence interval of 95% (Table 18).

She also compared the freąuencies of total precipitation for the winter months and summer months (Tables 19 and 20) in ranges: 0—50, 51—100, and > 100 mm for the 11 regions, and prepared suitable polygonal graphs (Figures 9 and 10).

With regard to the amounts of precipitation, the author assumed the following criteria for the estimation of years and seasons:

average:

dry or wet:

very dry or very wet: extremely dry or extremely wet:

when the deviations from the long-period mean amount do not exceed ±10%

when the deviations from the long-period mean amount

fluctuate within the rangę of ±11—25%

when the deviations from the long-period mean amount

fluctuate within the rangę of ±26—50%

when the deviations from the long-period mean amount

exceed ±50%.

Tables 21 and 22 contain the freąuencies of the above classes, computed for a 100-year period and grouped according to seasons, and alternatively, according to magnitude of deviations. An illustriation of the freąuencies of annual and seasonal amounts of precipitation in the distinguished classes, occurring in the 11 regions, is shown in histograms (Fig. 11). On their basis one can hardly speak of any of the regions as being outstanding, as far as shortage or excess of precipitation is concerned.