What is the meaning of よ in the phrase 雨よ雪に変わってくれ


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?




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.




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.

