When you look out the window and the horses are not standing at the gate for breakfast like they usually are...you know it is cold.
When you go out to leave for work and the only vehicles that will start are the old Dodge Diesels, and even those require cycling the glow plugs 3 times to get any fire...you know it is cold
When you have to pry your pick up doors up with a screw driver because they have frozen shut...you know it is cold.
When your cd player in said pickup cannot read a disc because the "eye" is frozen in one place...you know it is cold.
When you go to get the step stool you need to stand on to scrape your windows (because you insist on driving lifted vehicles)and it is frozen to the bed of the pick up...you know it is cold out.
When your icicles have icicles... you know it is cold out.
When your teenage opts for wearing a jacket for warmth, over looking cool for his classmates...You really know it is cold out!