The builder
Weather
Weather adds rain or snow over time. The tool appears only in worlds that have a weather system, and most of what it shows comes from that system rather than from us.
For the game itself, see the AI open world game maker.
It is a panel only
Weather has no verbs in the strip and nothing to drag. Pick it in the tool column and everything happens in the panel on the right, where each change shows in the world as you make it.
If your world has no weather system, there is no Weather button in the column. That is the tool being honest rather than offering settings that would write to nothing.
Intensity and snow cover
Two controls are always named the same way: Intensity, which is how hard the weather is coming down, and Snow cover, which is how much snow has settled on the ground.
Snow cover is separate from falling snow on purpose. A world can be under deep snow on a clear day, and it can be snowing onto bare ground.
Everything else comes from your world
The rest of the panel, including everything under Advanced, is generated from what the weather system in your project actually exposes, under the names that system uses. When that system comes with presets, the presets are in front and the numbers they set are under Advanced.
This means two projects can show different weather controls, and that is expected. The panel reflects the real thing rather than a list that would go stale.