-- It's the same physical temperature as -40 degrees C.
-- It's durn cold any way you measure it. Especially if the wind's blowing too.
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At -40 degrees Fahrenheit, the temperature is the same as -40 degrees Celsius. This temperature is extremely cold and can be dangerous to be exposed to for an extended period. It is a common point at which the Fahrenheit and Celsius scales intersect.
If you think purely in the Fahrenheit scale, the answer is 40 deg F.
-40 degrees Fahrenheit is equal to -40 degrees Celsius.
F = C x 9/5 +32Where F is degrees Fahrenheit and C degrees CelsiusAccordingly,-40 degrees Celsius = 32 - 40 x 9/5 = - 40 degrees Fahrenheit
40 degrees Fahrenheit = 4.4 degrees Celsius [°C] = ([°F] − 32) × 5⁄9
40 degrees Celsius below zero is equal to -40 degrees Celsius. To convert -40 degrees Celsius to Fahrenheit, use the formula °F = (°C × 9/5) + 32. Therefore, -40 degrees Celsius is equal to -40 degrees Fahrenheit.