In this series, we're examining the weather in the DCU's fictionopolises (starting yesterday with Gotham City).
When I first had this idea, I thought, "I can just go through every single story set in each city to which I have access, mark down the apparent season based on visual clues, tabulate, and look for patterns!'
Then I thought, "Sh'yeah, as if! That's a job for my fleet of post-docs."
Then I realized, "Oh, wait; I don't have a fleet of post-docs."
So, my 'analysis' of the seasonal ratios in the various DCU cities is cobbled together purely from my own recollections of stories I've read. Now, that is a fairly large sample, but perhaps my own impressions of the weather in those stories is distorted. After all, unless the weather is part of the plot, the creators don't usually bother with making it any particular season at all. Unless they're John Byrne.
A lot of artists take the easy way out and have the same characters wear pretty much the same thing all the time. For example, in the pre-Crisis DCU, Clark Kent was famous for wearing the same blue suit/red striped tie combo every day for about, oh, 40 years.
"And I'm not coming back until YOU stop wearing those stupid public underpants and get yourself a proper mandarin collar on your shirt!"
Some of those habits stem from the origins of comic books as a medium for children thanks to The Golden Rule of Color Conservation. It states that whenever convenient, characters should wear the same colors in their civilian identities as they wear in their superhero identities; it makes them easier for the readers to identify. Golden Age Dick Grayson did this a lot, and Clark Kent's habit of wearing a blue suit and red tie comes from the fact that Superman wears a blue outfit with red accents, too.
Bruce Wayne: easy-going guy, good sense of humor, fun date.