I remember that in my school years we learned about degrees Celsius, Fahrenheit and Réaumur. Later in my studies degrees Kelvin became important because Kelvin is the fundamental temperature scale in physics whilst Fahrenheit you still need in the States in order to choose the right clothing before leaving the house.
Degrees Réaumur are easily scaled into centigrades in mutiplying them by 1.25. Are degrees Réaumur still used? Wikipedia tells you that cooks and pâtissiers still measure temperatures in Réaumur when preparing a sugar solution.