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European data can be obtained from ECMWF at http://apps.ecmwf.int/datasets/data/interim-full-daily/levtype=sfc/ and they have an API https://software.ecmwf.int/wiki/display/WEBAPI/Python+ERA-interim+examples


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Zhang, Liu, and Zhang (2018) share the data from their paper in this GitHub repository. From the README: The CCSN dataset contains 2543 cloud images. According to the World Meterological Organization’s genera-based classification recommendation, we divide into 11 different categories: Ac, Sc, Ns, Cu, Ci, Cc, Cb, As, Ct, Cs, St. It is worth noting ...


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