How does my world adjust the weather?

My world needs instructions to adjust the weather. To use instructions, you need to turn on cheat mode:

1. When creating a world, click "Options for More Worlds".

2. Click on the permission to cheat and open it.

How to adjust the weather in my world;

1. Press the "/"key to open the input instruction.

2. Enter the command to adjust the weather./It's raining for rainy days,/It's sunny for sunny days,/It's thundering for thunderstorms.

3. After the input, press enter.