I’m pretty cavalier about measurements, I’ll use whatever’s convenient. I was born in 1954, so all my growing up and education was through the 60’s, as a result I automatically think in pints, miles, pounds, feet, inches, etc. However, I spent most of my working life in print and publishing, which was already moving into metric for paper sizes, using international A, B and C sized paper. Except America uses an A-size that’s Imperial, and a completely different size…
So now everything gets mixed and matches, I use Fahrenheit and centigrade, I have a good idea of how they match – my ideal outdoor temperature is around 70℉, about 20℃,
8-10℃ is about 48-50℉, and on the cool side. I can easily extrapolate from there,
30℃ is too sodding hot!