At Western, the fall and spring semesters have one thing in common: snow. Half of the fall semester and half of the spring semester are spent covered in snow. Rain is also a big part of the area, when it isn't snowing during the fall and winter months and even part of the spring months.
However, there is a plus: Western does an excellent job of making the sidewalks and walkways easily accessible and weatherproof. So if you're hoping for a class cancelation due to the weather, don't bet on it. Snow days are very, very rare.