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In this paper the spatial patt ern of Urban Heat Island (UHI) and its dynamical background are analysed. Furthermore, we examined the annual, seasonal and diurnal characteristics of UHI according to the Local Climate Zones (LCZs). The analysis was performed using one year (between June 2014 and May 2015) dataset from the measurement network of Szeged (Hungary). This network consists of 24 stations measuring air temperature and relative humidity. In the installation of the network the representativeness played an important role in order to that the stations represents their LCZs. We examined the thermal reactions during average and ideal conditions using the so-called weather factor. Our results show that the UHI is stronger in the compactly built zones and there are great diff erences between the zones. The greatest values appear in summer, while the diff erence is small in winter. The UHI starts to develop at sunset and exists through approximately 9–10 hours and diff erences are about 2 °C larger in case of ideal days, when the conditions (wind, cloud cover) are appropriate to the strong development of the UHI. The cooling rates show that the fi rst few hours aft er sunset are determinative for the developing of UHI. In addition, the eff ect of UHI on annual mean temperature is

Urban heat island patterns and their dynamics based on an urban climate measurement network