We found one dictionary that defines the word thundershowery:

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1. thundershowery: Wiktionary

Definitions from Wiktionary (thundershowery) ▸ adjective:  Characterized by thundershowers. ▸ Words similar to thundershowery ▸ Usage examples for thundershowery ▸ Idioms related to thundershowery ▸ Wikipedia articles (New!) ▸ Popular nouns described by thundershowery ▸ Words that often appear near thundershowery ▸ Rhymes of thundershowery ▸ Invented words related to thundershowery