I know to some people -7 isn't that cold. Well, here where it hasn't done that in years, it's freezing. It hurts to breathe. The windchill was -30. Just walking a few steps was putting me out of breathe. I pretty much took this week off. I have found that resting does much more good than harm. It's okay to rest. It doesn't mean you're weak. Sometimes we all need a break. I'll never understand why some people get so prideful about weather and something's. When you tell someone that it's -7 and they have to feel big and bad to tell you, "Well, it's -8 here!" Dude, I don't care. Either way they're both cold! I'm not killing myself to get a workout in that I can make up. I know some people would disagree and that's okay. I really don't care.
If you don't feel well it's okay to take a day or even a week off! Don't let someone make you feel obligated to go out and do it.