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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Convert 21 Degrees Celsius to Fahrenheit 21 Degrees Celsius = 69.8 Degrees Fahrenheit. Hot:84-99 F (29-37.5 C) Warm:70-84 F (21-29 C) Cool:55-69 F (13-21 C) Cold: Below 55 F (Below 13 C) Which is colder 0 C or 0 F?