I saw -30 on a bank thermometer (always known for their accuracy) walking to school in Barre, VT in 6th or 7th grade. Stopped at Dunkin Donuts and got a hot chocolate and had the same spill experience as the poster above. A couple of years later heard a radio announcer say it was -40 in Randolph, VT. That was in the way to school too, the bus driver had the local country station playing.