It sounds a bit odd, but we're currently displaying October's QotM, and now is the time to vote for November's . This is because we vote for the funniest post in the month the voting takes place. For example, at the end of October, Gnome's "In soviet Russia, Objective-C Regulate you!" post was the funniest post of the month (of October), so we display it all throughout November.
In other words: at the end of November we display the funniest quote of November, and so on.