Which word best describes the mood of this stanza from Longfellow's "An April Day?"

You know the title of the poem, so you know that the "season" mentioned in the first line of that stanza is spring. The "bright forms" in line 2 are probably spring flowers and blossoms, although there is a mention of colorful birds later in the poem. So these lines mean, roughly, "I love a spring day when the woods are full of new blossoms and there are no dark clouds in the sky".