my experience with 4350 and the tests by hodgon shows you don't need to account for that in shooter. spend your time adjusting for density altitude. i zero for each season with an average temp in the middle of the swing and my dope always tracks spot on using DA.
My 260 has shown about 0.5fps/F over the last years data between 28F and 92F from multiple Chrono readings as well as cold versus warm ammo testing last spring.