Temperature scales are entirely arbitrary. There is always a ratio of the amount of kinetic energy to raising the temperature scale one unit.
The Farenheit scale was based on the weather and climate of England.
The Centigrad or Celsius Scale makes more sense. The freezing point of water which is the same all over the world was chosen as the starting point or zero
The Kelvin scale makes even more sense. The zero in the Kelvin scale is absolute zero. This is the temperature where according to theory there is no kinetic energy left. The Volume of Helium gas is directly related to kinetic energy ( or heat) . A graph is made of the volume versus temperature
All temperature scales are arbitrary but some make more sense than others.