Plain English Meaning
A way of measuring how hot or cold something is, where freezing water is 32 and boiling water is 212. It is the temperature scale you grew up with in the United States.
Full Definition
A temperature scale on which, at standard sea-level pressure, water freezes at 32° and boils at 212°, giving a 180-degree span between those two reference points. It is the temperature scale most commonly used in U.S. aviation weather reporting, performance charts, and cockpit displays.
Context Anchor
Seen in some FAA training material, aircraft manuals, cockpit displays, and maintenance or operating notes when temperature is given in U.S. customary units.