The two temperature scales do not have the same unit size. The difference between 80 and 90 ºF is not the same size as between 80 to 90 ºC.
Celsius = (Fahrenheit - 32) x 5/9
15 degrees Fahrenheit = -9.4 degrees Celsius.
12 degrees Fahrenheit = -11.11 degrees Celsius
98.6 degrees Fahrenheit is 37 degrees Celsius.
-18 degrees Celsius = -0.4 degrees Fahrenheit
75 degrees Fahrenheit = 23.9 degrees Celsius.
1 degree Celsius = 33.8 degrees Fahrenheit.
(-6) degrees Fahrenheit = -21.1 degrees Celsius.
10 degrees Fahrenheit = -12.2222222 degrees Celsius
36 degrees Fahrenheit = 2.22 degrees Celsius
238.15 degrees Celsius = 460.67 degrees Fahrenheit.
9 degrees Celsius = 48.2 degrees Fahrenheit
39.7 degrees Celsius = 103.46 degrees Fahrenheit.
1,000 degrees Fahrenheit is 537.78 degrees Celsius.
325 degrees Fahrenheit = 162.7 degrees Celsius.
40 degrees Celsius = 104 degrees Fahrenheit
37.3 degrees Celsius = 99.14 degrees Fahrenheit
72.8 degrees Celsius = 163.04 degrees Fahrenheit