"Get used to running in weather in the 30's, the do sprints on a sunny 70 degree day. It's a big difference."
I'll agree with you there. But how do you resolve something like this? Weather is just a factor in football, but 19-22 year old bodies can't be impacted that much by a change in temperature, one way or the other. Older guys, maybe!
Since fewer people want to go to a bowl game in the midwest in January...I doubt you can. But it DOES make a difference. There's a reason that AFC and NFC north teams are built the way that they are, and that home field advantage becomes even stronger in late November and all of December, and that Tampa has won what, 2 games in their entire history with the temperature below 40 degrees (and lost 21 in a row)? Not having to change time zones, and not having to deal with a 30 degree temperature change is a sizable advantage. It's not everything by any means, but playing in homelike conditions helps.