Abstract
The study represents a report on the monthly, seasonal and annual amounts of precipitation, extremely dry and extremely rainy periods. The paper analyzes two 30-year periods from 1961-1990. and from 1991-2020. Data from the four meteorological stations in the upper part of the Nišava basin (Babušnica, Bela Palanka, Pirot and Dimitrovgrad) have ben used, three of which are in the Nišava basin and one of which (Babušnica) is in the immediate vicinity of the basin. The main goal of the paper is to provide an overview of the change in the precipitation in Pirot district at the end of the 21st century. The district is mainly an agricultural area and rainfall is very important for its development. The continental type of pluviometric regime is represented in the district of Pirot. The analysis of annual precipitation shows that the area of Pirot records a decrease in the annual sum of the precipitation with the increase in Dimitrovgrad, while Bela Palanka and Babušnca have no significant changes. In the first period that was considered by the conducted analysis (1961-1990), the secondary maximum precipitations occur on the average during the month of November and for the period of 1991-2020, the secondary maximum precipitation is a month earlier, in October, except for the station in Bela Palanka.
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