I'm like the guys who hunt most of the year with a bow weight that can be drawn normally regardless of the temperature and my clothing. The bows I usually hunt with are low to upper 50#s. When I went to Zimbabwe in June/July, I took my 68# bow because I hoped to shoot very heavy game with it. I shot some of my bows that are over 70# to get myself used to that weight, and all my shooting in Africa was in temperatures from 45 to 80 degrees, so I never wore very heavy clothing or had to deal with cold temperatures. I would not want to sit in a tree stand on a cold December morning for 3 hours here in Oklahoma or farther north and then have to draw my 68# bow to shoot a deer from an awkward position. That's why I stick with 55#, more or less, for most of my year around hunting, but I do shoot the heavier bows some to stay in shape and shoot them a lot more if I am going to hunt with them. So, I definitely agree with those who do not want to shoot their maximum draw weights in cold weather.
On the weather aspect, I agree that it is a lot colder up north (especially interior Alaska and Canada) than it is down here in the southern states, but I disagree that humidity does not affect the perceived level of cold or hot. Granted, Fairbanks at minus 40 degrees F is incredibly cold and Phoenix at 115 degrees F is incredibly hot regardless of the humidity. But Oklahoma at 20 degrees F with 90% humidity and a 40 mph wind will chill you to the bone too, especially when a few days before the daily high temperatures were 65 to 70 degrees F. The big difference between Oklahoma cold and Alaska cold is that in Oklahoma you might be uncomfortable, but in Alaska you might die.
Allan