As a European living in the US now for many years the temperature scale is the least of my annoyances. It's easy enough to memorize be ranges for what to wear. Fahrenheit is more granular, which is nice sometimes but really doesn't matter.
No, let's convert all the ridiculous weight/volume measures first. Having two kinds of ounces makes no sense. Measuring solids by volume (mostly) doesn't make sense. Having different units for different magnitudes doesn't make sense.
Fortunately things are often labeled in both metric and customary units so I can convert way easier.
Now if you'll excuse me I'm going to have my 12 fluid ounces of coffee and a 1/3 cup of oatmeal.