How does my world turn the weather into snow?

Turn on cheating and enter the command:/It thunders.

Note: Snowfall will only occur in biological areas where the temperature is lower than 0. 15 or higher than a certain height. Similar to storms, snowstorms can also reduce the daytime brightness level to 12.

Therefore, the snowfall weather is limited, for example, it can't snow in ultra-flat weather. Even if the above instructions are input, it is still a thunderstorm.

I hope it helps you. Please point out the mistakes!