@the_same_mountainbike I cannot find a definition of mathematical description, so I cannot respond to “I would argue that it isn’t a calculation, but rather a mathematical description”
I can find this "The NWS Windchill Temperature (WCT) index uses advances in science, technology, and computer modeling to provide an accurate, understandable, and useful formula for calculating the dangers from winter winds and freezing temperatures."
http://www.nws.noaa.gov/om/windchill/
Just like to make sure I state things correctly, so enlighten me, no offense intended.