Generally, my choices seem to be I-80 or I-40, with some less important differences at the beginning of the trip, around St. Louis / Kansas City, or Nashville / Little Rock. My main concern is, is I-80 generally too snowy / windy / wintery to drive all the way across it in January? Specifically through Nebraska, Wyoming, Utah, and Nevada?
Either way, I'm don't think I'll take I-70 through Denver.
There is also a bit of an extenuating factor, which is why I'm thinking about this now. I have a friend who's going to do most of the drive with me, but he's flying in from Sweden to meet me about 1/3 of the way into my route. So we're trying to decide what city he should fly into.
I'm open to suggestions. Just not sure what these areas of the country (and their interstate conditions) are like in January. Thanks, all!