You cant make it snow or rain.
For snow you must be in a Tundra biome (the ones that are coverd in snow and have spruce trees) any time its raining, go over to that biome and it will be snowing!
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You have to destroy snow with a shovel, you can not craft it.
You can only make snow golems on Minecraft XBox 360 Edition P S S P-Pumpkin S-Snow
You cannot change yourself into weather, but if you are looking to find out how to make it snow in Minecraft, there are two ways to do this. One is by going to a biome with snow on the ground or ice, and waiting for it to snow. The second way can only be achieved by commands, and it is by again finding a biome with snow or ice on the ground and typing /toggledownfall
Snow can go away in minecrafts, and can melt very slowly but it will still melt in the category its in on or by the minecraft.
Using World Edit, a multiplayer Bukkit plugin, you can do //thaw [radius] to melt all snow and ice in that radius.