I think it would be cool if parks actually closed for the winter months (or it could be turned on/off optionally.) like say, at the beginning of November, rides and shops are shut down and guests leave the park. Then towards the end of February, new guests slowly begin to arrive. This would cause a shift in profits, and players would have to plan accordingly. During the months of November-February, the park would have less expenses (no electrical bills) but would still have to pay employees who would be doing the usual maintenance.
We could even come up with different systems for the sc