Average temperature in the Netherlands

Reproducibility is an important pillar of the scientific method. The other day I was wondering if the average temperature in the Netherlands has changed much over time. There are plenty of charts available online [for example here and here] but I could not find the software that was used to (re)produce these charts. So I wrote a small application called "Temperature" to plot temperature charts with the help of Matplotlib. This application uses three configurable public datasets from KNMI: Leeuwarden, Twente and Eindhoven.