Board Thread:Support Requests - Getting Technical/@comment-4347751-20130802235559/@comment-4142476-20130803175520

As I figured out for a wiki of a friend of mine, the following JS contains the code to change the theme by season: Sylfaendren Wiki's Common.js

All you basically need to do is change the months and make classes with monthnames (January, February, ...) instead of Spring, Summer, .... After that, all you will need to do is add CSS elements in your wiki's css with .monthname after them (for instance "body.january { bla bla }")

Hope this helps :)