I do have school tomorrow, and I wish they'd issue a delayed opening. The wind chill outside is -2° now! 
If the heater at school works properly, you'll survive
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They have delayed 6 schools in the area today, becauase temps are 5 below, with wind chills near 20 below. It's a big deal, but not THAT big of a deal.
I've gone to school when the actual air temperature was -10..with the windchill lower than that.