Abstract
Using the methods of running means and integral difference curves, the monthly and annual air temperatures in upper parts of the Bulgarian mountains are studied. Data from seven stations are used, covering the period 1930–1989. Records of mean, minimum and maximum air temperature for January, April, July, and October are analysed. Periods of warming and cooling in separate months of the year are identified. In upper parts of Bulgaria during recent years, the temperature record has shown a trend towards warming in winter and cooling in summer. Mean annual temperatures were observed to decrease between 1962 and 1981.
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