Derek Carr has thrown for 4000 (or very close) in 4 seasons. Last year 4000 yards, 70% cp, 100 rating, 21TD, 8 INT. 14th in yards per game and 9th in passer rating. Those would smash Bears records and you could argue he has the worst WR group in the NFL. He's had a 28TD, 6INT season and a 32TD, 13 INT, so he has shown upside. He would be a big upgrade with a potential be really good with a change of scenery.
The cold splits aren't ideal but he's on a bad team. Cold games are on the road. Often late in a season when they are out of the playoffs. See bad splits and bad records with dome/warm QB's including guys like Brees. Peyton Manning had bad cold splits before going to Denver.
Nevertheless, its a media thing so here's some interesting narratives.
https://www.sfchronicle.com/raiders/article/Raiders-OC-Greg-Olson-Cold-weather-doesn-t-14933459.php
https://towardsdatascience.com/foot...of-weather-on-nfl-qb-performance-f0edb420623d
I just think if the Bears are too scared of a QB because he doesn't play well in road / cold games, then this is a perfect reason for us to continue to stick with Trubisky or go find another Glennon.
Do we really want to find a reason not to acquire a guy that averaged 260 passing yards a game and put up 100 rating last year? This would be a no brainer dream option but I honestly think its very unlikely.