Here's why:

* Celsius is a metric scale where water freezes at 0°C and boils at 100°C.

* Fahrenheit is an imperial scale where water freezes at 32°F and boils at 212°F.

To convert Celsius to Fahrenheit, you can use the following formula:

Fahrenheit = (Celsius * 9/5) + 32

So, 30°C is equivalent to: (30 * 9/5) + 32 = 86°F.