That is weird, you sound like you were both wearing lots of appropriate clothing. Your DH's diabetic problems could definitely have contributed to his having low body temp. Assuming that you stopped with him during both events means that you cooled back down from stopping.

Also, was your eating good? You need to eat more when it's cold because the body has to work that much harder just to maintain core temperature. I once went on a backpacking trip in Denali and had to eat about twice as much as I would eat on a typical backpack trip.

One thing you might want to rule out is the possibility of having low iron or anemia. I have been much more tolerant to cold since my doctor discovered that I was borderline anemia and I've been taking iron. My performance and stamina are much improved, as well.