Then you'd be wrong. Most schools don't have such a rule and one that does, Mason, its threshold wasn't reached. They say in their guidelines that they will close when wind chills go to -20 F. It didn't reach that here on Friday. Such a policy is so rare it made the Wash Post:
https://www.washingtonpost.com/news/...=.6df5b84cffa8And in Ohio, the Mason City Schools district has set specific temperature guidelines, published on its website:
Closing for Cold Weather
Mason City Schools will close on days when the temperature and/or wind chill are below -20ºF to -25ºF. Temperatures with wind chills in this range are considered dangerously cold if exposure is over 10-15 minutes. With students walking to school and waiting at bus stops, we consider this extreme cold a safety issue.
My point in all of this is what's changed? We didn't used to close when temps hit zero. Were we not concerned about student safety back then? I doubt that.