Meanings of temporary gloom in English

Mr. Telemakhos's temporary gloom gave way to a delighted smile.

The remembrance of the drama which Miette had so sadly evoked cast a temporary gloom over the lovers.

If there is sunshine on the two grand reaches of their path, the shadow which lies in the midst is necessarily but a temporary gloom.

To youth and natural cheerfulness like Emma's, though under temporary gloom at night, the return of day will hardly fail to bring return of spirits.