Calculation of nice ("sunny") days based on small privately owned solar thermal collector systems

The aim of the project is to develop an algorithm that is capable to calculate the amount of sunny
(„nice“) hours of a day based on data collected by solar thermal collectors used to heat up homes.
To evaluate the algorithm we will use the data collected by an owner of a solar thermal collector
system based in Vienna, Austria. The output of this evaluation should be a graph that tells us how
many hours of the day could be considered as sunny with the plotted data in csv files to allow future analysis.