So,
Here we have the formula for converting °C to °F:

We want to find the difference in Fahrenheit degrees between a temperature of 0°C and a temperature of 15°C. First, notice that the difference between 0°C and 15°C is 15°C. So, we're going to convert 15°C to °F using the equation above.

Therefore, 15°C is equal to 59°F which is the difference between both temperatures.