I'm not creating a new thread because I don't have more that I need to say.
I guess more posts on this thread are appropriate if we are still speculating about features to ask Dave to add (like Arif's idea about a small Koppen map under the gardening calender (map of the world?).
Or maybe some web application that looked up Koppen zones in YOUR area (by ZIP code and county or nearby city) and suggested what your zone might be, or highlighted regions of the globe that matched your zone, or found other ATPeople in your climate zone, assuming they had checked some check box(es) in their Profile.
Those are still "Site Talk" topics and fit into this thread OK.
At first I thought that discussion threads that spun off from that map or app would belong in "All Things Gardening" or some kind of "climate zone / regional" forum. But now I realize, "no", we are still trying to think of what to do with, or how to use, such a map to facilitate gardening.
So maybe this thread is still usable for this discussion, unless it becomes so big and active that it needs to be split and/or moved.