Fear not weird summer stout folks, your leader is here! Yes, I'm one of your own kind!
For the first year or so of brewing I had no fermentation temp control at all, aside from opening the window of that room at night. Which didn't do much when it's +25C out there overnight. Brewing went with what the weather would let me at that point in time. Not ideal, but I managed. After that point I tried a couple lagers fermenting in the keezer with acceptable results. I am now waiting on the delivery of a temp controller for a proper chamber, it's already got everything wired and mounted, just waiting on the brains.
Serving however I try to keep a variety on tap. Usually a light-ish crowd pleaser, something hoppy, something dark, and a "whatever I happen to have to fill the 4th slot." The last one would be great if I ever started actual brews intended for seasonal consumption. Never made a pumpkin or Christmas spice beer. Not that I'm opposed to them, just too busy brewing other stuff. I personally enjoy having variety available for myself and guests. "Sorry, it's stout and porter season" seems like a terrible thing for a host to say.
I'd say brew what you can. If this means you brew with the seasons to maintain certain yeast and beer styles in the comfort zone, so be it. If you have other means to maintain fermentation temperatures, brew what you feel like. Just don't a slave to the calendar telling you what to be drinking that time of year.