SFC-Cool weather, meaning less than 50(f) certainly chills me out when it comes to riding. Of course, the cold signals the end of the riding season when I'm feeling leg weary and riding more for the miles than the joy of riding, so that certainly factors in as well. I have ridden year round with a low of -7(f) ride although that was just to say I did it. Riding the trainer bores me to tears no matter what I do to try and mitagate that boredom and I won't do it. So winter activities include r-ball. walking, some light weightlifitng and running the snowblower. Gosh I can hardly wait!