This dissertation presents the methods used in reconstructing temporal patterns in weather and climate from documentary data dating back 210 years and the results. It investigates whether the widely used Pfister's indices can also be applied to smaller geographical areas such as the Paderborner Land. Researching a small area means having access to a limited amount of documentary evidence and therefore all relevant weather-related geographical factors and the topography must be taken into consideration. As a result, there was a need to develop a new, statistical-mathematical method, the ex-post-method as a forecast in the past. With this method, the monthly air temperature values for the areas of Bad Lippspringe and Bad Driburg from 1801 to 2010 were reconstructed. The verification of the data was carried out with weather data from, among others, the Reichswetterdienst, the Meteorological Service of the Third Reich. The impact of climate change on the Paderborner Land was illustrated using the linear climatemodel developed by Pfister. In doing so, climatic determinism was critically evaluated and investigated using the interactive model/feedback method developed by Kate. Finally, the historical impact of climate change in environmental history, with the emphasis on population development, land use and energy resources, was discussed. In conclusion, this dissertation demonstrates the interdisciplinarity of historical climatology research and the importance of its micro-historical (regional / local) focus.