During colder temps there isn't as much humidity in the air so the ligaments tend to tighten up to protect theirselves. Imagine a dry noodle versus a boiled, limp noodle. With the addition of humidity in the air it allows the ligaments to be more flexible and expands easier during whip action of the arm with quality retraction after release. It is a well-known fact that dry climate, higher altitudes and hotter atmospheres can determine athletic performance and is detrimental to the outcome. Runners, MMA fighters, Football Players and Boxers train differently when they know they are going to perform at an higher altitude, dryer or wetter climate/enviorment than what they are accustomed to. When you know that you are going to throw in colder temps drink a couple of bottles of water and run until you build up a sweat. Sweat will indicate that you have acquired heat from your inner-core replicating humidity. Your ligaments will perform much better after this. Also, make sure there is no sitting around between the run and the time you are scheduled to throw to ensure a cool-down process has not taken place until after you are done pitching. I hope this helps.