I love very cold mornings. Deer always move early and often. They need to keep their body temps up. Also, I bow hunt Ohio every year in very hilly country. If it's very cold, I will always hunt the sides where the sun hits first. They will always end up there to bed.
"There was right and there was wrong, and in between, an abyss filled with society's whiners, people who inherited the luxury of safety & freedom, while having done nothing to earn it."