Bring them into work and keep them warm that way, If you have to leave them in the car get to the center early and get them out of the bag and let them warm with out outside interference.
Pray they don't crack, but look at it this way they are just Storm balls

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''If their is a life after death,
then their is no death,
and if their is no death,
we do not live''
Progressive Metal Band
EVERGREY
MainzerPower