Great topic for this time of year. I have never let the temperature stop me from getting out. I will note that the coldest I have ever been was out side of Pensacola Florida in November with the temperature just under 32F and sleeping on the ground. Because it was considered "Jungle" training we were not allowed cold weather gear.
Having lived in various places in the US I have had the opportunity to camp in many different climates and I have always enjoyed the winter, especially in Maine and New Hampshire. The article wasn't bad and made some key points about keeping yourself alive. I would add several things.
1. Know the forecast. when you are out in the back county if the weather changes you can find yourself stranded for days from a wet heavy snowfall in the early winter or late spring.
2. Pace yourself, especially if you find yourself outside of your rig trying to get it unstuck because you failed to follow the 1st bit of advice. If you overheat you will be more susceptible to hypothermia.
3. Increase your calorie consumption, you will use about twice the calories in cold weather if you are out in the elements.
4. Alcohol = Bad, well not good alcohol will contribute to dehydration and make you more susceptible to hypothermia. Especially when you're passed out in the snow.
5. Double check your vehicles cooling system, I have seen plenty of overheated vehicles in the winter. If your cooling system won't transfer the engines heat away from the engine it doesn't matter what the temp is outside.
Cold weather shouldn't stop you from getting out but be smart about it.
