What does -20 centigrade equals in Fahrenheit?

Conversion from Centigrade (Celsius) to Fahrenheit is done in three steps:

1. Multiply value in degrees Celsius by 9.

2. Divide result of step 1 by 5.

3. Add 32 to result of step 2.

Conversion formula: [°F] = [°C] * 9 / 5 + 32 = -20 * 9 / 5 + 32 = -4 °F