The results presented in this paper are based on the observation of rainfall in the summer period, carried out in the area of the Agro- and Hydrometeorological Observatory Wrocław-Swojec of the Wroclaw University of Environmental and Life Sciences. The research data came from the years 1966–2007. Daily, nightly and 24-hour rainfall totals were investigated for 5-day periods, 10-day periods and months, and the number of events with rainfall during the day, night and 24 hours was analysed in ranges from 0.0–1.0 to 14.1–15.0 mm at 1 mm intervals. The trends of changes in rainfall totals in the 42-year period were assessed for the time steps used, and the percentage structure of rainfall was examined in individual months and depth ranges. In addition, the trends in the periods of occurrence of extreme rainfalls during the day, night and 24 hours were estimated. The analyses made it possible to determine to what extent the variation in the periods of rainfall occurrence can be an indicator of climate change on a scale of the point.

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