Thermometer bottomed out this morning so it is past 10 below F
You need a better thermometer. My outside mechanical goes to -60F, don't know how low the digital goes.
Somewhere in my archives I have a pic of my outdoor thermometer showing half a needle width on the colder side of -50C which is -58F. Cold by any man's definition.
"Keep thy heart with all diligence; for out of it are the issues of life." (Prov 4:23)