Here's how to convert Fahrenheit to Celsius:

Formula:

Celsius = (Fahrenheit - 32) * 5/9

Calculation:

1. Subtract 32 from the Fahrenheit temperature: 22.3 - 32 = -9.7

2. Multiply the result by 5/9: -9.7 * 5/9 = -5.39

Therefore, 22.3 degrees Fahrenheit is equal to -5.39 degrees Celsius.