From Creatures Wikia
The Weather Generator will add weather to the Capillata. It can add rain, snow, clouds, or sunshine and they each have an effect on the room.
The agent has five modes you can cycle through by clicking on it:
- Standby - It does nothing.
- Condensation of Vapor - Creates rain clouds (adds water)
- Cloud Formation - Creates regular clouds (decreases light?)
- Decrease Temperature - Creates clouds with snow (decreases heat)
- Artificial Sun - Creates a moving sun (adds heat and light)
Note: Having more than one of these in a single DS world can slow down your game quite a bit. Try to only have one at a time.