-30 Celsius?
I wouldn't even leave the house for work
They don't close the schools here until it drops below -40C even then it's only optional whether kids stay home as the school must remain open regardless in case some parent drops them off or they wander in on their own. At this temp most of our vehicles will not start so we will be very slow today as the customers are smarter than us and stayed home. Then again there always is that one idiot who comes in to test drive a Ram 3500 diesel and gets pissy when we tell him no frickin way are we gonna try starting a diesel not plugged in at -35C. He usually gets back in his Phord and leaves....