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Diurnal Variation and Duration of Significant Summer Rains in North-Western Romania. The diurnal variation and duration of significant rains were analyzed, based on climatic data from 11 meteorological stations located in North-Western Romania, in different landform conditions. We selected only the rains which meet the above-mentioned feature (maximal intensity higher than 0.04 mm/minute, and average intensity higher than 0.02 mm/minute, or an amount higher than 2.5 mm/m2), recorded during the warm season (April-October) between 1975 and 2006, resulting a number of 20,567 such situations. The diurnal variation of the moment of start for the significant rains during the entire season indicates that the highest frequency is during the afternoon and the evening (between 2 p.m. and 9 p.m. Romanian summer time). A secondary maximum is recorded at the beginning of the night (10 p.m. – 11 p.m. Romanian summer time). Monthly, the highest frequencies are recorded in June and July, summing together 41.7% of all the situations. One should notice their “shift” from the mountain area to the surrounding areas, as significant rains are registered 2 to 3 hours earlier in the highlands than in the hilly uplands, depressions or lowlands. The duration of these rains is most frequently less than one hour (38.1%), taking place mostly during the afternoon and the evening, followed by rains lasting between 3 and 6 hours (18.6%).

Keywords: diurnal variation, significant rains, frequency, North-Western Romania.