i'd definately bring a car, even if you're going to live close to campus. If you want to get the parking garage at school, fill out the paperwork early because the spots run out fast, the uncovered lot is cheaper, and what i have, but on those cold windy snowy mornings, even a five minute walk to the school is enough motivation to skip class.
the weather is def. a good reason to have a car, as well, unless you don't mind the aforementioned cold, wind snow, etc. Also, depending where you are and where you are going, it's probably not a good idea to be walking by yourself, at least when it's dark out.
the other thing is that while there are bus stops relatively close to PCOM and a train station, as well, the Philadelphia public transportation is not the best in terms of frequency of service, so you might find your social activities curtailled by the schedules (i think the trains stop running after around midnight or so and buses earlier). also, at $2 fare, it's a bit expensive. but then again, so is the car insurance , so take your pick 🙂