To convert from degrees Fahrenheit to degrees Celsius, subtract 32, multiply by 5, and divide by 9. In this instance, 20 - 32 = -12 x 5 = -60 / 9 = 6.6 recurring (that is, 6.6666...) degrees Celsius.
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-20 degrees Celsius = -4 degrees Fahrenheit.
(-20) degrees Celsius = -4 degrees Fahrenheit.
20 degrees Celsius = 68 degrees Fahrenheit.
20 degrees Fahrenheit is colder.
20 degrees in Celsius = 68 degrees in Fahrenheit (warm) 30 degrees in Celsius = 86 degrees in Fahrenheit (hot)