Here's how to convert a Celsius temperature increase to Fahrenheit:

Formula:

* °F = (°C × 9/5) + 32

Calculation:

1. Multiply the Celsius increase by 9/5: 48.0 °C × 9/5 = 86.4

2. Add 32 to the result: 86.4 + 32 = 118.4

Answer: An increase of 48.0 degrees Celsius is equal to an increase of 118.4 degrees Fahrenheit.