| Резюме: |
In the context of global warming, in accordance with the recommendations of the World Meteorological Organization for detailed study of the regional climate, the object of study is the climate in the nonmountainous part of Bulgaria from 1961 to 2018, and the subject of study is - climate fluctuations for the periods 1961–1990 and 1989–2018. They were discovered by applying various statistical and mathematical methods to some climate elements, indicators and climate indices, such as - average minimum and maximum temperatures, ice days and tropical nights, days with precipitation of 1.0 mm and number of days with snow cover. Various trends have been identified, both in regional and annual distribution of the studied climate characteristics. The scientific novelty of the study is the detailed analysis for the first time of the index "tropical nights", its increase by 18 days per decade. Through the introduction of a Climate Change Coefficient and a Complex Climate Change Coefficient to determine the degree of change of a climate element / elements, it was established that greater climate change has occurred in Northern Bulgaria. For the period 1961-2018, on average for all stations, the annual minimum temperatures increased by 0.2 ° С, and the annual maximum temperatures by 0.4 ° С per decade. The number of ice days decreases by 6 days per decade. The number of days with precipitation over 1.0 mm remain at the same levels, and those with snow cover increase by 5 days per decade, but with large regional differences.
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