Fahrenheit.
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The official unit of temperature in the SI (the International System) is the Kelvin. However, in practice, and especially outside the scientific community, the degree Celsius (a.k.a. Centigrade) is often used.
Professions that do not use scientific notation are most anything outside the sciences.
Still 54 degrees if the 18 degree drop is inside!
18.48 degrees Celsius
32° F = Zero °C .