The paper presents the results of research on the series of days with precipitation in the cold and warm half of the year on the example of several meteorological stations located in selected mesoregions of Southern Poland. In the years 1971-2010 the average number of the series of days with precipitation differed in the warm and the cold half of the year and varied from 9.5 in Lapanow to 11.3 in Stare Olesno in the warm half of the year, and from 10.1 to 11.3 in Lapanow in the cold half of the year. The majority of the cases were the 4 to 9 sequences of days with precipitation in both seasons, then series of 3 days and 10 to 16 days with precipitation were observed. Series of days with precipitation longer than those mentioned above were noted in a minority of cases, and sequences of more than 17 days with precipitation were mostly observed in the cold half of the year in Stare Olesno. In the decade of 2001-2010 an increase of the number of series of more than 23 days with precipitation was observed. The statistically significant trend of the changes in the number of the series of days with precipitation was confirmed. A 3 days downward trend in the cold half of the year in Tuchow, a 4 to 9 days upward trend in the cold half of the year and a 4 to 9 days upward trend in the warm half of the year in Glubczyce, and a 10 to 16 days upward trend in the warm half of the year in Lapanow and Tuchow were proved. The general number of series of days with precipitation showed a statistically significant upward trend in the cold half of the year in Glubczyce nad Tuchow, whereas in the warm half of the year the general number of series of days with precipitation indicated a statistically significant downward trend in Tuchow. The share of series of days with precipitation in the total seasonal precipitation was varied and showed an upward, statistically significant trend in the cold season in Glubczyce, Lapanow and Tuchow.