Hello! I am thinking about having my our wedding in mid September (around the 17th, 2016) in Iowa (outdoors), and I cant seem to figure out if at that point in time the trees and everything will be changing or if everything will still look green and summery?? Please Help!! I've always wanted a fall wedding, but i also don't want it to be too cold for all of the guests since it will be outdoors without much shelter from the elements...