When converted to Celsius, 42 Fahrenheit is 5.5556 degrees. The formula for converting Fahrenheit to Celsius is: F - 32 / 1.8000.
Both Celsius and Fahrenheit are used to measure temperature, although Fahrenheit is most commonly used in the United States. Celsius is part of the official metric scale and it is used more often in other countries. To convert Celsius to Fahrenheit, the formula is F = (Celsius x 9) / 5 + 32.
Fahrenheit as a measure of temperature was named after Daniel Gabriel Fahrenheit. He proposed the temperature scale in 1724. Celsius was named after scientist Anders Celsius in 1948.