What I'll say is what I think, just because unfortunately I don't live in a place where winter here in Miami is like summer in Canada.
If you don't have enough space for a tredmill, I think jumping ropes is a very very good alternative.
About not changing the routing to avoid taking away from what you do, I don't know if I'm mistaken but, you will take away if you DON'T do anything, but if you do, whether is the same or not, you're not going to lose any of your achievements. In fact, I believe in muscle memory / confusion. So, doing a change of what you do, at least for the time being while winter is there, will confuse your muscle and break that memory created on them, helping you with the workout.
Anyone correct me if I'm wrong please.