Does anyone have experience on the change in point of aim due to cold weather? I'm going to be sighting in a Biathlon rifle is 25-35 degree weather and was wondering what the change in impact might be, if any, when temperatures climb into the 90's. Maybe the normal 22lr ranges are short enough to eliminate any such influence.

I'd tend to believe that the rifle would change as much as the ammo. I believe I'd just make a trial run to see. Leave the rifle & ammo inside and then shoot it, move it outside left everything cool off and try again

Far too many variables to even make a WA guess as to what will happen.
Best to use the empirical method i.e. try it and see.