It is not truly known if June Howe was a daughter of Orville. Her name is mentioned in the Falls Reporter newspaper article of Orville Howe's death as Mrs. June Edgar one of those who mourned the loss of Orville. The connection between Orville and June comes from the fact that Ida Howe is also mentioned in the article as Mrs. Ida Edgar. Ida married Scott Edgar May 18, 1889. After having identified all 9 children of Orville and Julany the prospects that June Howe is one of their children is not good.
Further investigation is required to confirm the connection.