From PinataIsland.info, the Viva Piñata wiki
Gameplay Tip: When it rains, you don't need to water your plants.
In addition to the usual sunshine or rain, Viva Piñata: Trouble in Paradise adds snow showers to the mix of garden weather.
- Sundial - Can be turned on or off, to make it constantly sunny.
- Wooden flower - Can be turned on or off, to bring out the sun and create a rainbow.
- Windchime Mk 1 - Can be turned on or off, to cause constant rain and occasionally a thunderstorm with lightning.
- Pirate statue - Makes it constantly rain.
Note: Rain will change to snow, over snowy terrain.