Fahrenheit is intuitive. 0°F is the lowest air temperature measured in a town called Danzig in winter 1708-09, and water boils at 212°F. 4°F is ammonium chlorid

Fahrenheit is intuitive. 0°F is the lowest air temperature measured in a town called Danzig in winter 1708-09, and water boils at 212°F. 4°F is ammonium chloride brine, and water freezes at 32°F. These are ballpark figures, you need Celsius or Kelvin to precisely define Fahrenheit.