If you find yourself needing to quickly
convert Celsius to Fahrenheit, here is a simple trick you can use: multiply the temperature in degrees
Celsius by 2, and then add 30 to get the (estimated) temperature in degrees
Fahrenheit.
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The Fahrenheit scale is still used in the USA and a few island states. In the Fahrenheit scale water freezes at 32 degrees and boils at 212 degrees (at sea level), so 58 in that scale is cool. Comfortable to mildly chilly, depending on the person's temperature preference.