Meaning of 小春日 in Japanese

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Definition of 小春日

こはるび(koharubi) 【小春日】

(n) mild late autumn day (around November); mild late fall day →Related words: 小春

こはるびより(koharubiyori) 【小春日和 ·小春びより】

(n) Indian summer (around November); mild late autumn weather; mild late fall weather →Related words: 小春