I don't have the exact stats but I could tell you for sure that over the past few years, when a Wrigley Field game has an over/under of 11 or higher because of the wild winds there, the under ends up hitting the majority of the time, although again, I don't have the exact stats to prove it, so I can't tell you if it's a significant "majority." I do, however, study this stuff for hours every single day, as most of you have learned about me, so I take a special mental note for these specific games (Off the top of my head, there was a Wandy Rodriguez game at Wrigley last year, for example, that was over/under 13, and the under ended up hitting relatively easily).
Had I saw this thread earlier yesterday, I would have cautioned you about this trend, so now I'm just pointing it out for those who will consider the high over/unders at Wrigley over the rest of the season. That's why, for the most part, I don't take over/unders at Wrigley, as the wind has too much of an effect in most games. When that happens, you're making an over/under play based on the weather instead of the pitching matchup, which is just ridiculous in my opinion, and therefore does not deserve a bet in most cases if it's significant enough.