Interesting comment on Fahrenheit, as I would say it has too much resolution for day to day use. A nice sunny day is in "the low 70s". A cold winter day is in "the high 20s". There is too much precision in the units to give an exact numeric value, so we round it to low/mid/high. That implies that the general unit we should be using is somewhere around 3 times larger than Fahrenheit degrees, because that is the size of the unit we use in speech anyways.