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This paper analyses variability of precipitation in Osijek in three periods of thirty years, starting from the year 1901 till 1990. In period from 1931 till 1990 primary maximum of precipitation was in summer (June), and secondary maximum was in autumn (November). Primary minimum of precipitation was at the end of winter (March), and secondary minimum was in autumn (September). In researched period total amount of precipitation decreased, same as average relative variability. Largest decrease was in autumn (October). Average relative variability in researched period has also decreased. Minimum of variability was in June, a month with maximum precipitation and maximum of variability was in October, although the minimum of precipitation was in March. One of the reasons for maximum variability in October is a significant decrease of precipitation amount in that month. [ABSTRACT FROM AUTHOR]