The Celsius rhyme.

Note

This article is mostly helpful for us lowly Fahrenheit folks.

A little rhyme I learned in high school physics class that makes it easy to get the gist of Celsius degrees.

Zero's freezing
Ten is not
Twenty's warm
Thirty's hot

°C 010203040

°F 32506886104

Note

Ironically the word Fahrenheit is unmistakeably German and comes from the surname of the German-Polish-Dutch physicist Daniel Gabriel Fahrenheit (1686–1736), who proposed his temperature scale in 1724.

I’m not a master of German, but fahren means to drive, and the -heit suffix is kind of like -ness in English — it thingafies.

For example, sauber → Sauberkeit, means “clean” → “cleanliness”. So presumably, if Fahrenheit were a real German noun, it might mean something like “drivenness or “driveity”.