No outdoor sports competition in Equestria has ever been rained out. Every parade takes place under clear skies. The weather is scheduled moons in advance, and those arrangements are enforced by government employees. So in theory, the mere existence of the Weather Bureau should keep ponies from having something to complain about.

In reality, the existence of the Bureau gives ponies an address they can write to.

And when you factor in Ponyville...

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