On a server with multiple normal type worlds, if you place a Command Block in a world other than the default world and add the toggledownfall command to it, it will always toggle the weather in the default world, whereas running the command manually works in the world you are currently in.
Example:
World1 : Default World
World2 : Another World
Place Command Block in World2, add command "toggledownfall"
Activate command block
Rain toggles in World1
Comments 6
Wouldn't it just be easier to use a plugin for this? Why bother using a command block that requires you to do something physical in the world to turn something off when you can just type a command or change a config file and have it not be affected by which chunk the command block is in etc.
The popular and useful bukkit plugin Essentials has "power sign" function allowing players to click on signs that will run commands without having to establish individual permissions.
The multi-world functionality is not available in vanilla Minecraft.
Please file a bugreport over on the bukkit tracker.