Don't hunt in the cold as much as I used to, and now mostly shoot carbons, but never noticed a difference in POC arrow performance between temperate and cold temperatures.
In really cold temps, my clothes were more bulky, and there's a good possibility I didn't draw as long as I normally would, but the arrows always seemed to go where they were supposed to if I did my part.
A few self-bows I shot during cold weather did loose some cast. Got the feeling that might have occurred as well with glass laminated bows, but not really sure that wasn't a figment of my imagination. No way for me to test it.