Since there are vnailla commands in recent snapshots that let you do such things as disabling random spawning and mob griefing, is there a command to PERMANENTLY disable rain/snow/storm? I know about /toggledownfall, but it's not permanent. I'm talking about SSP, so don't say "there's a plugin for that".
Create a redstone clock and connect it to a command block
<facepalm> I tried to do infinite redstone loop connected to command block with this command, but when you unluckily exit MC when the rain has been turned on (matter of lessthan 1 second), the rain will instantly be active when you open the world again.
Optifine's settings won't preserve if you send world save to someone who has pure vanilla MC, so that's not an option.
you don't need to just type /toggledownfall and place a block where he has a water mealon to turn off the rain, i made a clock and attatched 2 command blocks to a clock 1 turns off the rain /weather clear the outher sets the time to day /time set 1800
just connect a redstone comparotor to a redstone block, set it to subtract mode, connect the redstone out the other end around back to itself, extend the redstone a bit, hook it up to a diode and a command block, and set the command to /weather clear... Check the attachment for a photo if your confused still