I got up about an hour later than the predicted low (Omaha, NE), and it was -27 when I got up, so we probably had a low of -28. For all of my life that I've paid any attention to lows, this is the second lowest of my life, and the record for my life was -30 but that was at several thousand feet higher elevation.
I am impressed that my pitifully under-insulated, leaky window, house has maintained heat and apparently no frozen pipes (tho I haven't tried the guest bathroom). It seems like the house is designed with the water pipes following the heat vents (at least I've noticed the cold water is warm in winter and ice cold during summer when the air conditioning is running).
It is amazing to me that the little birds are out flying around, tho I notice that some of the ground birds (meadowlarks) are perched high up a tree in the sun.