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Interannual variation of the seasonal cycle in temperature Ralf Liebermann April 10, 2008, 2:00pm Building 19, Room 4.15 University Potsdam, Campus Neues Palais Temperature is changing throughout the year and is subject to many variations regarded as random, partly as a consequence of limited knowledge and the general inability to calculate the complex dynamics of climate systems precisely. In this regard any prospects about the effects of a changing climate on life and human civilization are linked to the estimations about the evolution of temperature variablity, especially the dominant cyles of daily and seasonal variation. The aim of this diploma thesis is to make a geographic distinguished study about temperature changes in Europe during the last century along with developing statistical techniques to do so. According to this, the presentation contains two different approaches: an exploratory analysis to determine observed changes by means of a statistical comparison as well as a parametric analysis modeling the annual cycle with harmonic functions.