Up here in God's Country, 25 degrees during deer season is considered darn near balmy. I would guess the average temp I hunt is 10 degrees and I've hunted (and killed) deer in temps as low as -10 and windchill of -35.
In fact, it gets so cold up here that the Democrats have their hands in their own pockets... :D
So being, I don't over-bow myself from the jump. The three bows I hunt with the majority of the time are 52-53 lbs at 28" (I draw 28.5).
I have another that draws 51# @ 29" which is super smooth & easy to draw, if I need it.
Can I shoot heavier? Sure, but until deer start
wearing body armor, there's no need. Any of these bows will easily bury an arrow to the feathers or simply pass through a deer at 20 or so yards.
IMO, a bigger/more important consideration is actually practicing with the cold weather clothes you will hunt in. More often than not, it necessitates a modification of form and when a buck is standing like a 3D target at 20 yards is not the time to find your string is going to hit your jacket sleeve, or the tightness across the shoulders makes you hit 6" right...