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In investigating aridity in Vojvodina (a region in the northern part of Serbia), the Forestry Aridity Index (FAI) was used. This index was chosen due to being one of the most suitable indices for the analysis of the interaction of climate and vegetative processes, especially in forestry. The spatial distribution of the FAI for annual and decennial periods, as well as its annual trend, is analysed. Satisfactory compatibility between the low (forest) and high (steppe) FAI values with the forest and steppe vegetation on the Vojvodina terrains was obtained. The calculated values of the FAI showed that there was no particular annual trend. These results correspond to the earlier calculated values of the De Martonne aridity index and the Pinna combinative index. Therefore, it can be concluded that there were no recent changes in aridity during the observed period. Results of the correlation indicate weak linearity between the FAI, and the North Atlantic Oscillation and El-Niño South Oscillation.

© Geografski inštitut Antona Melika ZRCSAZU 2018. The annual trends of surface mean monthly air temperature and monthly extreme temperatures were analyzed from ten meteorological stations in Kosovo. The data refer to observation periods between 1949 and 1999 for four stations, and observation periods between 1965 and 1999 for the remaining six stations. Trends were analyzed for nine time series. Positive trends were found in six series, and negative trends were found in three series. After an assessment of these trends using the Mann–Kendall test, positive trends were confirmed in four series, a negative trend was confirmed in one series, and in one series there was no trend, whereas trends were characterized as slightly positive in two time series and slightly negative in one series.

Based on folk sayings 'Cold winter-cold spring,' 'Cold winter-hot summer,' and 'Hot summer-cold winter' people were for centuries trying to express a long-term weather prediction. In this paper the scientific verification of folk sayings was performed primarily by analysis of the seasonal air temperatures. To include the largest possible number of cases and to perform a detailed processing of data, a classification of seasons was made according to several standards-meteorological-statistical, extreme and mean seasonal temperatures. Conceivably, the sayings are true in many cases, but that it does not mean that every hot summer will be followed by a cold winter, or that a cold winter will be followed by a cold spring and/or cold summer.