Ted, It's not weather related. It's maintenance. They typically aerate the greens at PB in August. Throw in the conflict with the Concourse de' elegance, and you have potential for a lower quality experience. Now, I should place a caveat. I caddied there ten years ago. It's possible that practices have changed.
Back when Mark Michaud was the super, June was the best time to play because he would take the greens to US Open speeds to acclimate, and learn how far they could get pushed. Also, back then they used huge tines, resulting in greens that stimped around 7. Certainly if you can see past the maintenance, and want to experience the architecture, go for it. But at $500 I would think optimizing value would be paramount.
BTW, Fog is not a deterrent to me, and is more likely in June, but, that's just my sick sense of enjoying all that mother nature has to offer.
If you have the luxury of going whenever you want, I still would either change your plans to June, or, call and ask for their aeration schedule. (and the Concourse)