When the construction XがViます is transformed into the passive construction, it indicates that Y is negatively affected by X. Typical intransitive verbs used in this construction are: 降る(rain), 入院する(be/get hospitalized), 死ぬ(die), and 泣く(cry).
わたしたちは雨に ふられました。← 雨がふりました。
We were caught in the rain. ← It rained.
わたしは父に 死なれました。
My father died [and it saddened me].