Urban heat island is a phenomenon, when the urban environment heats more than the surrounding rural environment, due to the population density, manner of settlement and other human factors. It is the most prominent at anticyclone weather, predominantly in bigger cities and its impact can also be perceived in centres of small villages, where houses stand closely next to each other. Several researches on the topic of urban heat island have already been conducted in Slovenia, most detailed were the ones in the two largest Slovenian cities. In the area of Novo mesto, one of the bigger towns in Slovenia, the characteristics of urban heat island have not been researched yet. I have carried out two types of measurements; the measurements of the air temperature in different parts of the town with stationary thermometers and route measurements. The phenomenon of urban heat island is present in Novo mesto, mainly in the morning and evening hours, at anticyclone weather. In the period between December and March, the average difference between the town centre and the outskirts was around 1°C. Because of its small size, specific population structure and many green areas, Novo mesto is not yet coping with significant negative impacts of urban heat island.
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