Even though I've had manias in the summer, I almost always get depressions. Plus, I don't like the heat and having to go from sweating and wearing minimal clothing to going back into the air conditioning. When I was young, I liked it, but not anymore. Plus, I'm a little self-conscious now in skimpier clothing and prefer fall/winter clothes. I think my medication has something to do with my lack of tolerance in the heat as well. I also think there's something that goes on chemically where I don't do well in the summer. Fall is my favorite season, although the first couple of weeks of September is a struggle.
Anyway, sorry that you're experiencing this.

I thought I was one of the rare ones that struggles with summer time depression with BP, since I hear more people discuss mania/hypomania.