As a veteran of the Oxford area, be sure to plan your routes while it's still warm outside. The university is relatively good about clearing sidewalks, but depending on when you run you may run into ice and snow. Just make sure you have good tread on your shoes and be careful about black ice and you'll probably be fine (I ran on snowy and icy sidewalks in Columbus quite a lot, but SW Ohio is better known for freezing rain and sleet while Columbus is known more for snow). If you run into a really nasty day and you still want to run, I believe the Miami U rec center does have an indoor running track. You might not get to see the trees or your neighbors, but you will be able to avoid hurting yourself on a patch of ice.
You should be able to plan shorter routes in Oxford with pretty good traffic avoidance, but for longer routes I'd suggest either going to Hueston Woods and running on trails or saving those runs for breaks when hardly anyone is in town. Once you get to Oxford and see the traffic and people-herds between classes, you'll understand.
If you want specific advice on routes or whatnot, just let me know.