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Read this phrase in a blog. I think the basic meaning of the phrase 雨よ雪に変わってくれ is "The rain is changing into snow." But I don't understand the usage of よ in this case. Is it a particle? Or is it a typo?

user3169
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It's a vocative particle, like the English vocative "O" in the following example:

O Rain! Please change into snow!

It sounds poetic or literary.

It's defined as 係助詞「よ」 in 集英社国語辞典:

係助詞。相手への呼びかけ。「泣くな妹よ、妹よ泣くな」「風よ伝えよ、かの人に」「モズよ、寒いと鳴くでねえ」

I bolded the meaning, which is basically vocative.