Often times, not as much as you might think. Wind is the ultimate x-factor when it comes to weather affecting totals. History has shown that football games played in rain and snow don't stray too far away from the norm, but heavy wind can really shake things up. It is important to pay attention to weather forecasts early in the week. Games where 20+ mph winds are in the forecast will likely see a drastic dip in their total from the time the lines open until the time the game is played.