The formula to convert Fahrenheit to Celsius is:

°C = (°F - 32) x 5/9

So, to convert 10 degrees Fahrenheit to Celsius, we have:

°C = (10 - 32) x 5/9

°C = (-22) x 5/9

°C = -110/9

°C = -12.22222...

Therefore, 10 degrees Fahrenheit is approximately -12.2 degrees Celsius.