Tatjana Popov, Slobodan Gnjato, Goran Trbić


The paper analyzes trends in the extreme temperature indices based on fixed thresholds in Bosnia and Herzegovina during the 1961–2016. Based on data from 12 meteorological stations, trends in both warm and cold temperature indices were determined using the nonparametric Mann-Kendall test and the nonparametric Sen’s slope estimator. The observed tendencies in indices based on fixed thresholds were as expected in a warming world – warm temperature indices (summer days, tropical days and tropical nights) displayed the significant positive trends, whereas cold temperature indices (icing days and frost days) showed the downward tendencies. The annual occurrence of summer days and tropical days increased on average for 5.3 and 4.8 days per decade, respectively, whereas icing days and frost days displayed downward trends in the range of -1.7 and -3.6 days per decade, respectively. The obtained results indicate that the climate system warming was more a result of very pronounced positive trends in the warm temperature indices than the downward tendency of cold ones. The most prominent changes were observed in Banja Luka, Bugojno and Zenica regions. Both trends, positive in warm indices and negative in cold ones, become more pronounced in the 1990s and particularly since the beginning of the 21st century. Further research should focus on the assessment of the observed trends impacts on natural and socio-economic systems.


temperature; indices based on fixed thresholds; trend; climate change; Bosnia and Herzegovina

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Alexander, L. V., Zhang, X., Peterson, T. C., Caesar, J., Gleason, B., Klein Tank, A. M. G., Haylock, M., Collins, D., Trewin, B., Rahimzadeh, F., Tagipour, A., Rupa Kumar, K., Revadekar, J., Griffiths, G., Vincent, L., Stephenson, D. B., Burn, J., Aguilar, E., Brunet, M., Taylor, M., New, M., Zhai, P., Rusticucci, M., & Vazquez-Aguirre, J. L. (2006). Global Observed Changes in Daily Climate Extremes of Temperature and Precipitation. Journal of Geophysical Research, 111, D05109. doi:

Bartholy, J., & Pongrácz, R. (2007). Regional Analysis of Extreme Temperature and Precipitation Indices for the Carpathian Basin from 1946 to 2001. Global and Planetary Change, 57(1–2), 83–95. doi:

Branković, Č., Cindrić, K., Gajić-Čapka, M., Güttler, I., Pandžić, K., Patarčić, M., Srnec, L., Tomašević, I., Vučetić, V., & Zaninović, K. (2013). Sixth National Communication of the Republic of Croatia under the United Nation Framework Convention on the Climate Change (UNFCCC) Selected Sections in Chapters: 7. Climate Change Impacts and Adaptation Measures 8. Resarch, Systematic Observation and Monitoring. Zagreb: Meteorological and hydrological service of Croatia.

Brown, P. J., Bradley, R. S., & Keimig, F. T. (2010). Changes in Extreme Climate Indices for the Northeastern United States, 1870–2005. Journal of Climate, 23(24), 6555–6572. doi:

Burić, D., Luković, J., Ducić, V., Dragojlović, J., & Doderović, M. (2014). Recent Trends in Daily Temperature Extremes over Southern Montenegro (1951–2010). Natural Hazards and Earth System Sciences, 14(1), 67–72. doi:

Caloiero, T. (2017). Trend of Monthly Temperature and Daily Extreme Temperature during 1951–2012 in New Zealand. Theoretical and Applied Climatology, 129(1–2), 111–127. doi:

Filahi, S., Tanarhte, M., Mouhir, L., El Morhit, M., & Tramblay, Y. (2016). Trends in Indices of Daily Temperature and Precipitations Extremes in Morocco. Theoretical and Applied Climatology, 124(3–4), 959–972. doi:

Fioravanti, G., Piervitali, E., & Desiato, F. (2016). Recent Changes of Temperature Extremes over Italy: An Index-Based Analysis. Theoretical and Applied Climatology, 123(3–4), 473–486. doi:

Fonseca, D., Carvalho, M. J., Marta-Almeida, M., Melo-Gonçalves, P., & Rocha, A. (2016). Recent Trends of Extreme Temperature Indices for the Iberian Peninsula. Physics and Chemistry of the Earth, Parts A/B/C, 94, 66–76. doi:

Frich, P., Alexander, L. V., Della-Marta, P., Gleason, B., Haylock, M., Klein Tank, A. M. G., & Peterson, T. (2002). Observed Coherent Changes in Climatic Extremes During the Second Half of the Twentieth Century. Climate Research, 19(3), 193–212. doi:

Hartmann, D. L., Klein Tank, A. M. G., Rusticucci, M., Alexander, L. V., Brönnimann, S., Charabi, Y., Dentener, F. J., Dlugokencky, E. J., Easterling, D. R., Kaplan, A., Soden, B. J., Thorne, P. W., Wild, M. & Zhai, P. M. (2013). Observations: Atmosphere and Surface. In Stocker, T. F., Qin, D., Plattner, G. K., Tignor, M., Allen, S. K., Boschung, J., Nauels, A., Xia, Y., Bex, V., & Midgley, P.M. (Eds.), Climate Change 2013: The Physical Science Basis. Contribution of Working Group I to the Fifth Assessment Report of the Intergovernmental Panel on Climate Change (pp. 159–254). Cambridge and New York: Cambridge University Press.

IPCC (2014). Climate Change 2014: Synthesis Report. Contribution of Working Groups I, II and III to the Fifth Assessment Report of the Intergovernmental Panel on Climate Change [Core Writing Team, Pachauri, R.K., Meyer, L.A. (Eds.)]. Geneva: IPCC. Retrieved from

Kioutsioukis, I., Melas, D., & Zerefos, C. (2010). Statistical Assessment of Changes in Climate Extremes over Greece (1955–2002). International Journal of Climatology, 30(11), 1723–1737. doi:

Kivinen, S., Rasmus, S., Jylhä, K., & Laapas, M. (2017). Long-Term Climate Trends and Extreme Events in Northern Fennoscandia (1914–2013). Climate, 5(1), 16. doi:

Klein Tank, A. M. G., & Können, G. P. (2003). Trends Indices of Daily Temperature and Precipitation Extremes in Europe, 1946–99. Journal of Climate, 16(22), 3665–3680. doi:

Knežević, S., Tošić, I., Unkašević, M., & Pejanović, G. (2014). The Influence of the East Atlantic Oscillation to Climate Indices Based on the Daily Minimum Temperatures in Serbia. Theoretical and Applied Climatology, 116(3–4), 435–446. doi:

Lakatos, M., Bihari, Z., Szentimrey, T., Spinoni, J., & Szalai, S. (2016). Analyses of Temperature Extremes in the Carpathian Region in the period 1961–2010. Időjárás – Quarterly Journal of the Hungarian Meteorological Service, 120(1), 41–51. Retrieved from

Nemec, J., Gruber, C., Chimani, B., & Auer, I. (2013). Trends in Extreme Temperature Indices in Austria Based on a New Homogenised Dataset. International Journal of Climatology, 33(6), 1538–1550. doi:

Popov, T., Gnjato, S., & Trbić, G. (2017a). Trendovi indeksa ekstremnih temperatura u Bosni i Hercegovini ‒ Primjer Mostara [Trends in Extreme Temperature Indices in Bosnia and Herzegovina: A Case Study of Mostar]. Glasnik (Herald), 21, 107–132. doi:

Popov, T., Gnjato, S., & Trbić, G. (2017b). Trends in Frost Days in Bosnia and Herzegovina. Glasnik Srpskog geografskog društva – Bulletin of the Serbian Geographical Society, 97(1), 35–55. doi:

Ruml, M., Gregorić, E., Vujadinović, M., Radovanović, S., Matović, G., Vuković, A., Počuča, V., & Stojičić, Dj. (2017). Observed Changes of Temperature Extremes in Serbia over the period 1961–2010. Atmospheric Research, 183(1), 26–41. doi:

Sheikh, M. M., Manzoor, N., Ashraf, J., Adnan, M., Collins, D., Hameed, S., Manton, M. J., Ahmed, A. U., Baidya, S. K., Borgaonkar, H. P., Islam, N., Jayasinghearachchi, D., Kothawale, D. R., Premalal, K. H. M. S., Revadekar, J. V., & Shrestha, M. L. (2015). Trends in Extreme Daily Rainfall and Temperature Indices over South Asia. International Journal of Climatology, 35(7), 1625–1637. doi:

Skansi, M. M., Brunet, M., Sigro, J., Aguilar, E., Groening, J. A. A., Bentancur, O. J., Castellon Geier, Y. R., Correa Amaya, R. I., Jacome, H., Malheiros Ramos, A., Oria Rojas, C., Pasten, A. M., Mitro, S. S., Villaroel Jimenez, C., Martinez, R., Alexander, L. V., & Jones, P. D. (2013). Warming and wetting signals emerging from analysis of changes in climate extreme indices over South America. Global and Planetary Change, 100, 295–307. doi:

Trbić, G., Popov, T., & Gnjato, S. (2017). Analysis of Air Temperature Trends in Bosnia and Herzegovina. Geographica Pannonica, 21(2), 68–84. doi:

Zhou, Y., & Ren, G. (2011). Change in Extreme Temperature Event Frequency over Mainland China, 1961–2008. Climate Research, 50(2–3), 125–139. doi: (Accessed on October 17, 2017)



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