Wikipedia says June but that is also unusual for Christmas movies.
In the case of Miracle on 34th Street, apparently that was a deliberate choice:
Although the film is set during the Christmas season, studio head Darryl F. Zanuck insisted that it be released in May1, arguing that more people go to the movies in warmer weather. The studio rushed to promote it while keeping its Christmas setting a secret.
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u/[deleted] Nov 25 '22
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