I feel your pain.
First, get the mindset it doesn't have to be either or.
Doesn't have to be couch potato or full on gym.
Until spring comes, at least do the basics so you are not totally giving up.
Walk the malls, the skywalks, the neighborhood, something anything no matter how basic and simple.
I know one guy that walks round and round up and down an eight story parking ramp downtown. Be careful for the crazy drivers.
So when spring comes back around and you can start back into a more energetic exercise program, at least by then you won't be re-starting from square one, jello legs.