Geografické informácie / Geographical Information 22 / 2018 / 1 23 SELECTED TEMPERATURE CHARACTERISTICS OF BRNO AND SURROUNDING AREA Karel Dejmal, Petr Kolář, Josef Novotný, Alena Roubalová Abstract The paper sets out to evaluate air temperature in Brno and its surrounding area. Data from professional station Brno-Tuřany as well as institutional and amateur stations dated 2015 and 2016 were used as a basis. The evaluation draws data from joint dates recorded on those stations. Result presents a summary of basic elements influencing air temperature in Brno and its surroundings. The impact of sensor placement and microclimatic conditions on measured air temperature values is more significant than the impact of altitude and latitude. The most significant factors for air temperature appeared to be the positioning in valley-like locations, type of surface around the station and shadowing of sensors by objects in proximity of stations. Despite the cited influences the data from majority of amateur meteorological stations could be considered as serviceable for air temperature monitoring. Keywords: air temperature, amateur meteorological stations, Brno, monitoring Introduction At present the temperature conditions in the Czech Republic are evaluated on the base of data from meteorological stations run by the Czech Hydrometeorological Institute (CHMI). Although the number of synoptic and mostly automated climatological stations exceeds 200, the complete coverage of our territory and consequently a correct interpretation of air temperature data in some areas with specific microclimatic conditions is not successful. The aim of our paper is to provide an evaluation of temperature conditions in Brno and surrounding areas within a 25km range through data obtained from professional, institutional and amateur meteorological stations. Besides the CHMI, the amateur data could be collected from the Amateur Meteorological Society (AMS) and from owners of private meteorological stations nowadays. Contrary to those of the CHMI, most of amateur stations do not comply with standards of the World meteorological organization (WMO), thus do not always present an ideal basis for climatological purposes (CHMI, 2011, WMO, 2008). Apart from elementary physical-geographical factors other parameters such as placement of temperature sensors, type of surface and a complexity of station surroundings play a certain role. All those parameters influence the air temperature in specific locations and in