You will definitely want to check out July and August. April may be more like what you are used to for August.
I spent part of four summers in the south, and often recall the wisdom of a cowboy that my mother was once on a jury with—he preferred cold to hot, because “you can always put more on, but you can only take so much off.” That said, I prefer rain to snow because you don’t need to shovel rain, but you can’t have everything.
That said, I can’t imagine being happy within three hours of Seattle——or Portland.
Check Southern Missouri in the Ozar Mountains, beautiful place, nice people. Good luck in all. Jonesboro Arkansas was nice years ago.