Well... Regardless of the seasons my CJ account has been performing multiples of what Adsense has been doing. In fact I have gotten rid of the Adsense from almost all of my sites.
For the holiday's and the spring I always target trends that are common New Years Resolutions. I do well without targeting during the Christmas season but by just getting visitors through social media for resolution-like products and services I do very well.
I'm in Ontario, not sure if that makes a difference.