Traditionally, depending what you read and trust, an NFL home field advantage is worth 3 points on the chalk.
I realize that. I guess my question was more related to weather and field (as touched on by Jous).I realize this is an excercise in hypotheticals (which is really all we have left, as everything else has been talked to death...), but my question, restated more clearly is

oes extreme weather typically have an effect on the betting line?(i.e. if tommorow morning they were predicting a monsoon with 25 MPH winds would the line be moved - or just move as a result of money coming down on one side particularly hard?)