When I was in college the dean decided if campus was open or not during bad weather. We were in Northern New England so we could handle a lot, but ice storms are bad no matter where you live.
One winter we got a particularly nasty one and the roads were just sheets of perfect ice. The dean looked outside her window and declared that classes were on despite many objecting. A lot of students (including myself) didn't risk the commute that day and I doubt any were counted against in grades considering a professor was killed in a car accident due to the awful conditions. 
The next time we had a light dusting of snow class was cancelled. 
This happened to me in High School. We had nasty, rainy-slushy weather all weekend, and Monday rolled around with freezing temps. There was ice everywhere, broken branches on the lawns, and the salt trucks and plows were trying to clear the highways first. Did the Super cancel school? Nooooo. Because, you see, he was in Hawaii, and it was nice *there,* so how bad could it be in Michigan in March?

I came very close to having my first car accident when I slid through a stale red light with my foot pumping the brakes. We made it to school safely, but a lot of people just stayed home. Amusingly, about two weeks later, we had more snow on the weekend, and school was called delayed at 5 AM, then cancelled an hour later. At that point, the sun rose, the 1/8 inch of snow turned to fog for an hour, and then it was a gorgeous, sunshiny spring day. Bro and I decided it was a makeup call.