Frozen — Theresa Shaver

Book 5 in the Stranded Series
Winter temperatures in Alberta, Canada can drop as low as -30 to -40 C (-22 to -40 F) for weeks at a time. These temperatures are manageable in modern civilization.
The odds of survival at these temperatures decrease when all modern conveniences such as furnaces and electricity are taken out of the equation. Such is the life many would face after an EMP.
Mrs. Moore's students had faced unsurmountable odds of getting home. Each and every teenager in the group had been forced to do and act well beyond their years to survive to this point. Unfortunately, their parents, grateful to have them back refuse to accept the changes in their children and attempt to force them back into the young roles their children had before the end of civilization. What they don't understand is that it's not possible to erase those changes.
When the teen's town is hit with a devastating virus, they take it upon themselves to travel first to the closest military encampment to find the medicine their loved ones so desperately need. Stone walled at every turn they make the hard decision to embark on an epic journey to a faraway city to search the ruins for help they need.
Traveling through a Frozen wasteland, they not only have to fight the elements and other survivors but also the inner struggles and changes each one has to accept and live with.
It's not just the weather that has Frozen.