That’s great. It’s easy to read, for a change. I’m 5b, right along the western coast of Lake Michigan just north of Milwaukee. Diana is in 5a, due west of me in Dane County (Madison). I was surprised to se the temperature differences between 5a and 5b. I’ll probably still plant to Zone 4 for perennials and shrubs.
You were the first person I thought of when I saw the new map and legend. :)