how cold is it?

I've lived my whole life in cold climates. Here's the way I see it:

Temperature	Label	Frequency
30°F ... 10°F	seasonal	Every winter
10°F ... 0°F	chilly
0°F ... -10°F	cold
-10°F ... -20°F	very cold
-20°F ... -30°F	bitterly cold	All winters but one
-30°F ... -40°F	brutally cold	~25% of winters
-40°F ... -50°F	temperatures that must not be named	~10% of winters
< -50°F	never experienced	0% of winters

Notes:
Temperatures in Fahrenheit because it is a more human-centric scale (i.e., below 0 feels cold, above 100 feels hot).

I've been out at -46°F. If you think you've been out where it's colder, remember this doesn't indicate wind-chill, which is a bunch of hooey. I've skied (at >30mph) at -44°F. According to NOAA, that's -90°F, but that's not how cold works. Cold is tough because it changes the nature of things in the environment—wind chill has no effect on these physical properties.