How can I exercise safely in winter when I have a cold?

Asked by KM, Grandview, Washington

Like everyone else, I am intent on losing weight in the new year. I am in my mid-20s, very overweight, and trying to change back to the healthy lifestyle I used to have. My specific concern is about walking in the cold, with a cold.
I really love walking, so I'm making it a major component of my workout plan (along with weight lifting, and healthier eating), but I am on the tail end of a cold right now, and when I come inside from a walk, my cough is much worse and sometimes my ears hurt. I love walking in the cold (the weather is in the teens and 20s) and don't want to give it up, but I also don't want to make myself sicker.
I know I could use a treadmill, but the truth is that I hate them and I get bored no matter what I do. I'll almost certainly get another cold this season, so what do I need to do to keep myself healthy outside in the winter?  More....Cnn Health