Yea they call school here in western NY when its super cold as well, Its because a lot of students walk to school. because if you live withing a mile or 2 from the school there is no bus service. It was -9 today with a wind chill of like -20.
i still think its odd because it never happened in Maine where i grew up. We didnt call school unless there was over 12" of snow on the ground when the buses were supposed to go out