kolotok
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You wouldn't believe it. I don't know how it's done, but there are maps where the same monster week keeps repeating. Or, for example, the Ira the mage map, where in 2000 months (!!!) there wasn't a single monster month. Apparently, by combining objects on the map, you can achieve a guaranteed effect of (not) spawning certain weeks or months, including plague.
I'll get around to looking at the code for generating weeks and months someday, but that's not a certainty.
On one of the maps, I encountered a regular devil month – the main component of our attack force. And you could either not upgrade dwellings in castles and get an overgrowth due to the monster month, or upgrade the dwellings, get a more "agile" army, but lose the growth. I noticed back then how the map manages to generate the same monster month.