"Cold" is a relative term, which depends on what you consider the most comfortable temperature. The answer will vary from person to person.
This exactly.
There is no anchor point. No perspective.
If you consider 0°F, then what do you consider normal? This isn't included in the problem.
It's like asking to draw a line from point A to point B, and then place a point C along the line created from points A and B, and while point B exists, point A does not, so therefore point C cannot be placed, because no line has been created.