The data is pretty clear: Manning is less accurate outdoors, with a lower average per attempt, lower TD rate, higher INT rate and lower passer rating outdoors. More importantly, he wins just 60 percent of his games outdoors ....
Read more: http://sportsillustrated.cnn.com/2012/writers/kerry_byrne/03/07/peyton.manning/index.html#ixzz1ogHzFSN2