http://www1.cs.columbia.edu/CAVE/software/wild/image_set.php

https://www.programmableweb.com/news/top-10-weather-apis/analysis/2014/11/13

https://www.google.hr/search?q=weather+sky+images+database&oq=weather+sky+images+database&aqs=chrome..69i57.14133j0j4&client=ms-android-samsung&sourceid=chrome-mobile&ie=UTF-8