What temperature is the same in °C and °F?

−40°. It's the only value where the two scales coincide because of their different slopes and intercepts.

Why is human body temperature 98.6 °F not 100?

98.6 °F is the Fahrenheit equivalent of 37 °C, which is the rounded normal core body temperature in the metric system.

Convert °C to °F for US weather forecasts, oven temperatures and fever readings. Type a Celsius value to see the matching Fahrenheit reading.

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From

1 °C = 33.8 °F

°F = °C × 9 ⁄ 5 + 32

What temperature is the same in °C and °F?: −40°. It's the only value where the two scales coincide because of their different slopes and intercepts.
Why is human body temperature 98.6 °F not 100?: 98.6 °F is the Fahrenheit equivalent of 37 °C, which is the rounded normal core body temperature in the metric system.