ok you're right (I did a little google-guided research on it), although it's not unprecedented:
In 1995, with Erik Kramer at QB, the Bears set a team record for passing yards per game with 233.9 while compiling the fourth-most points in team history with 392. Kramer set club records with 29 touchdown passes and 10 interceptions (least among 16-game starters) while standing as the last Chicago passer to start all 16 games. The 1995 squad produced the third-most total net yards (5,673) and the second-most first downs (340) in team history. The offense also featured a 1,000-yard rusher and two 1,000-yard receivers in 1995, the only such season in team history.
Also, this was the Bears' first time having a single 1000-yard receiver since 1970.
Still, I like the fact that they play 3 road games in Nov. in the somewhat less chilly/swirly east (NYG, NYJ, NE) and 2 of their 3 games during the fantasy playoffs are in domes.
I guess I see your point, but trying to predict the weather can be kind of useless sometimes. I live in Minnesota, and we have Nov/Dec days where it's cold as hell but there's still no wind.
I would like to see some more research on offensive numbers in cold-weather climates. Maybe I'll do some more of it...