When I saw -33 degrees, I thought it had to be wrong because I am in Pennsylvania, not Williston, ND or Barrow, AK. I went over to the kitchen window and pulled back the analog spirits type thermomenter so I could read it, and it was nearly off the scale but did agree with the truck’s digital thermometer. I actually had multiple days of sub 30 degree below zero temperatures... on different weeks.
I am also in Pennsylvania, near Valley Forge, abnormal days of negative degrees Fahrenheit. Also froze a lot of plumbing in the area. Not much snow, but the Temperature was nasty cold. But when it’s summer, the car thermometer always starts off hotter. From what I heard, state college and northwest Pennsylvania got it worse at 10 to 15 degrees lower.