The poem "How Beautiful is the Rain!" by Henry Wadsworth Longfellow is written in stichic as opposed to stanzaic form. It uses both rhyme and meter flexibly in the manner of an ode rather than having a fixed form which is repeated in every line. While most of the lines are in iambic trimeter, some are regular and some acephalous; Longfellow also uses iambic dimeter for emphasis. Although the poem includes many lines rhymed as couplets the scheme is not consistently applied.
In terms of figures of speech, perhaps the most obvious is hyperbole, or overstatement. There are several instances of alliteration (repetition of a consonant sound) in the poem, including "rapid and rushing river", "fenceless fields", and "dry grass ... drier grain".
The poem also uses metaphor, describing time as a river and comparing the rushing water on the streets on which boys are sailing toy boats to an ocean.