"They run on low sulfur diesel fuel, so that fuel can gel up if it gets too cold and then we're obviously really anxious about a bus stalling or breaking down and having kids sit on it and it's not heated", said NICE Community Schools Superintendent Bryan DeAugustine.
"We're a tight network, we like to be in solidarity as much as possible", says Dr. Joe Gothard, superintendent for St. Paul Public Schools. The district also called off classes on Monday.
"If our buses break down and we can't get a bus there quick enough, kids can be extremely cold", he said. "Those are very real things".
Local school districts are all keeping a close eye on the forecasts, said Niagara Falls City Schools Superintendent Mark Laurrie.
As a general rule, if your student could get frostbite by standing outside for ten minutes, school would likely be canceled, but the schools reserve the right to make those decisions at less severe temperatures as well. Governor Arne Carlson did it three times between 1994 and 1997. "So it just makes sense to close school down for that day and use one of our snow days or add a day in the summer if we have to".