What is actually being asked here?
The feeling is easy to name: winter is scary. The useful move is turning that dread into a question you can actually look at. Instead of “will we be okay,” one way to start is “will the money coming in during the slow months cover the costs that show up no matter what.”
The relevant concept here is cash flow, the timing of money moving in and out. It is a different thing from whether the business turns a profit over a full year. A business can be profitable across twelve months and still have a couple of months where the account runs uncomfortably thin.