I am going to do my Master's thesis about social graphs (network) of weather data for HVAC design. The results will be published an open source web-based tool. But first, I need weather file data. There are just too many of them for manual download. I was wondering if there is any repository to download them all at once; or if there is a pattern in the file path so that I can download it by running a script (I couldn't find any pattern).