The OCB says commercial hops are grown between 30 and 52 degrees. The 52 would be inclusive of the Worcestershire hops region in England. I don't know what the 30 would include.
45 - 55 includes the European fields, and that may be the Haas groups viewpoint. I am interested if you tell us more about the Haas Hops Academy. A little envy too.
For Nateo - wine grapes were grown as far north as Scotland, then the Little Ice Age happened.
30-40 would include South Africa, Argentina, Australia, and NZ (the north island, anyway. I'm not sure where they grow hops in NZ).
I've read about people planting wine grapes again in Scotland. I don't think it's really taken off yet.