Just how cold is COLD?

At a weather station located at a local High School, not 4 miles from my apartment here in the middle of the Great American Corn Desert, the temperature is MINUS 19. It also records that there is an 8 mph wind out of the WSW. At some point, the temperature numbers become purely academic . . . don't they? At some point, it just doesn't get any "colder" in terms of sensation. I have to remind myself on mornings like this that temperature is nothing more than a measure of the average kinetic energy of the molecules of a substance. As temperature goes down, molecular energy is dropping; things just become more rigid. Things like the water molecules in your fingers and toes . . .