It eventually bottomed out at Minus -16 degrees (actual temperature) below zero Fahrenheit.
That's really cold!!!

Our indoors Solar Room (part of our home) dropped to 31 degrees indoors (below freezing), even with 3 space heaters running. It's too large with too much glass and a high ceiling to be able to handle this kind of crazy, extreme cold. Hope my houseplants still in the Solar Room survive. I have blankets over some of them, just like what I do when I want to try to save tender vegetation from early frosts in the Fall.