It's a bit of a myth most places up north never close for snow. The reason is these areas are more rural where snow is easier to manage because there are fewer roads to clear. In urban areas like Syracuse, despite being used to receiving heavy snow, clearing roads is just harder due to higher traffic, narrower streets, and hilly terrain. As a result, schools do close in the Syracuse metro area if it's still snowing and they've received more than ~6" while places north of there are open despite getting a heavier snowfall.