Born and raised in MN, so this competition is a bit one sided. Have seen -30f more than once.
Foam car seats are like a brick at -5f and lower. Propane (the heating fuel) freezes about -35. Your spit freezes before it hits the ground at/near the same temp (-35f), and will ball up and roll down the hill. Natural rubber (tires, seals, CV boots) will crack/shatter if flexed near -40 (C or F). Many venues have 'plug in' connections in their parking lots so you can keep yer engine warm while shopping/dining.
Have camped in frigid temps, unsure how cold but there was gobs of snow. Had to clear the snow to build a fire. Feet/fingers numb when I awoke, Scoutmaster said to put my frozen clothes on and start walking. Painful, as I couldn't feel much, but it worked.
Cleared snow, built a fire, raked off coals and ash, pitched the tent on the 'warmed' ground.
Texans, and everyone in this polar event, are suffering. They are not used to it, neither is their infrastructure.
Rick