2. Methodology

    2.1 Study Location and Air Temperature

Frankfurt, Germany, is situated in Central Europe inland at geographical coordinates of 50.116 degrees latitude and 8.684 degrees longitude and sits at an elevation of 117 meters. The topography within a 3-kilometer radius of Frankfurt am Main city is mostly flat, with a maximum elevation change of 83 meters and an average elevation above sea level of 114 meters. Based on data from 1985–2015, the city experiences a peak in temperature in July and August, then slowly decreases to its minimum in December and January. September, thus, still shows warm weather, and while September 2013 stays quite stable with a peak in the early days, September 2014 is warmer and a bit more variable. However, if we compare the extreme temperatures throughout the year, we can observe similar results. Unstable weather, locally both in time and in topography, could be a slight difficulty to test station accuracy as temperatures can be as much as 4-5°C different from day to day, according to records.