Well, I for one bought my Akubra Fed while living in Portland, OR and worn it pretty much nonstop whenever I wasn't riding the bike for almost 2 years straight.
(I suppose a little extra stiffener would have made it street legal
Portland seasons are as follows: 3 month nice summer, 3 mos mild rain/drizzle, 3 mos of cold rain drizzle, 3 mos sometimes mild, somtimes cold rain/drizzle. Start over again...
The Fed held up great. I would usually just hang it on the door after coming in from the rain and it would be fine. The hat has yet to develop any noticable taper. The felt is weathering nicely to.
Part of that I directly attribute to the rain exposure, but no real serious fading due to weather.
About every 4 months or so I may re-steam the brim to get the real deep swoop.
As RK always says... "best hat i've worn..."