The way winter's going now, you won't have any problems. It's been reaching the 50's this week.

If you need to be here, then better to do it sooner than later. It's only going to get colder and conditions will worsen before they get better. Just deal with the 4wd after the fact, and honestly, your civic will be fine to drive and probably get you further than the 2wd f250. I have a buddy with a front wheel drive saturn and another with a front wheel drive mercury cougar that have made it through conditions I never would have guessed their cars would make it through.

Converting a 2wd to 4wd wouldn't be very cost effective, but again, something you can deal with down the road...