“The CIE Standard General Sky is a solution in search of a problem, and Professor Tregenza is doing a great service in bringing it down to earth.”
Comment by Joe Lynes on this paper by Peter Tregenza: “Analysing sky luminance scans to obtain frequency distributions of CIE Standard General Skies”  I couldn’t agree more at the time, and nothing since then has changed my mind. The case for the General Sky wasn’t helped by not having a means to select the ‘right sky’ from, say, weather files. Some methods did appear , but I don’t believe they gained any traction. I reckon the General Sky, as a practical tool, is still looking too overcooked to be useful.
 P. Tregenza. Analysing sky luminance scans to obtain frequency distributions of CIE Standard General Skies. Lighting Research and Technology, 36(4):271–279, 2004.
 D. Dumortier and M. Kobav. Use of the Perez all weather sky luminance model to obtain the frequency of CIE standard sky types. Lux Europa, Berlin, pages 137–140, 2005.
 V. Ferraro, V. Marinelli, and M. Mele. A method for selecting the cie standard general sky model with regard to calculating luminance distributions. Journal of Atmospheric and Solar-Terrestrial Physics, 95-96:59 – 64, 2013.