Here's why:
* Emphasis on Nature: The poem exalts the power and beauty of nature, specifically the West Wind, a key characteristic of Romanticism.
* Subjective Emotion: Shelley expresses strong personal emotions and feelings, particularly about the wind's destructive and transformative power.
* Imaginative Language: The poem is full of vivid imagery, metaphors, and personification, using language to create a powerful and evocative experience for the reader.
* Themes of Change and Renewal: The West Wind is seen as a force of change and renewal, both in nature and in the human spirit.
* Idealism and Rebellion: The poem also contains a sense of idealism and rebellion against societal norms, reflecting Romantic ideas of freedom and individual expression.
While "Ode to the West Wind" is a Romantic poem, it also has elements of other genres, like:
* Lyric Poetry: The poem's lyrical and musical quality, focusing on emotion and personal expression.
* Nature Poetry: Its focus on the natural world and the wind's influence on it.
Therefore, while the poem is primarily considered Romantic poetry, it draws upon elements of several other genres.