Remind me again; what exactly is Fahrenheit based on?

Fahrenheit temperature scale, scale based on 32° for the freezing point of water and 212° for the boiling point of water, the interval between the two being divided into 180 equal parts.

Oh right, it’s based on freezing and boiling points, and everything else about it is just wildly arbitrary and unnecessarily complicated.

See: improvements in Alaska (of all places) for details