Welcome to Canada, where having a jacket is a birth right. Going to school in more than 5 cm of snow (or most likely more) is nothing new for students attending Canadian schools. As for snow days, if you can manage to somehow drag yourself to school, then that, unfortunately, means someone else can drag themselves too, meaning: No snow day.
So, how do you know what to expect? First, check the weather. Start with the temperature, which can be colder depending on the wind chill. Then there’s the wind blowing at a freezing km/h from what seems like every direction.