So you would agree that a calming -31 is a lot tolerable than -31 with wind? It is not the mercury that change but wind with the mercury will make it colder.
You stated fictitious numbers which they're are not hence why it always stated "fells like".
Now, if you work outside but working up high without coverages, that dynamic turns outrageously like perdition as the vortexes changes in elevations.
This is why, generally, they give people the options to work once it passes -28 (without windchill). At -31, they automatically shut it down.