You know it's cold when...

...your vehicle growls and then screams at when you try to start it.

...If it does start, it refuses to blow warm air even though you've let "warm up" for 20 minutes.

..."number of seconds until skin freezes" becomes part of the local weather forecast.

...the St. Paul Winter Carnival shortens the length of its parade.

...exhaling creates frost on male facial hair.

...boogers freeze deep within the nose upon contact with outside air.

...you don't care how your hat made your hair look.

...not getting frost bit is cause for celebration.

...you say how many degrees below zero it is and then have to clarify it with, "and that's not including the wind chill."

...a Minnesotan says it is.

I woke up to 26 below zero - without the wind chill - I'd say it's a tad chilly.