I was gonna suggest that they could simply share the snow plow vehicles for the rest of the year with other countries (like how we share firefighters with Australia) but then I realized the part of the world that would most likely need them when NYC doesn't is the opposite hemisphere and those vehicles are not easy to ship lol
I don't think it snows enough in big Australian cities :D And there aren't (yet) electric super-jumbo cargo planes to ship these mechanical monstrosities.
