I agree that grouping by month has more sense than by day. Hence, the logical way should be YYYY/MM/DD, as you would group by year first. As usual, you should know which year it is, so you just say MM/DD. But again, you know which month it is, so Europeans start by the day. As European, I am used to it, but I do prefer MM/DD after some time living in the US.
On the other hand, Fahrenheit does not make any sense to me. With metrical system, at 0º water freezes, at 100º water boils. There are 100 steps in between, equally distributed. ¿At what temperature does water freeze? At 32F. It boils at 212F.
We will let distances and weights for another discussion, because that is science fiction.