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What is -20°C in fahrenheit?

-20°C = -4°F

Water freezes at 0 °C (32 °F), so that's freezing or below.

Celsius to Fahrenheit near -20°C

-26°C-14.8°F
-25°C-13°F
-24°C-11.2°F
-23°C-9.4°F
-22°C-7.6°F
-21°C-5.8°F
-20°C-4°F
-19°C-2.2°F
-18°C-0.4°F
-17°C1.4°F
-16°C3.2°F
-15°C5°F
-14°C6.8°F

Convert any amount

Result
-4°F

Quick reference for converting Celsius to Fahrenheit

Formula
°F = °C × 1.8 + 32
Quick rough maths
To get the Fahrenheit, take the Celsius, multiply by 1.8, then add 32.

More: Celsius to Fahrenheit converter and table.