Traditionally you could pretty well set a timer for my mania for late May/early Juneish. Very reproducible over the years. That said, 2019 was completely different. I am still to this very day dealing with a great big mania with psychosis that began in November or so. A totally different pattern for me. Usually, the big depression comes in October. Who knew?

So, things can change, even if there is historically a pattern, even a very long one. Like, decades. Or so has been my experience.