In Harry Potter and the Goblet of Fire, during a lecture in Divination where Harry suddenly dozed off, Professor Trelawney said to him:
“I was saying, my dear, that you were clearly born under the baleful influence of Saturn,” said Professor Trelawney, a faint note of resentment in her voice at the fact that he had obviously not been hanging on her words.
“Born under — what, sorry?” said Harry.
“Saturn, dear, the planet Saturn!” said Professor Trelawney, sounding definitely irritated that he wasn’t riveted by this news. “I was saying that Saturn was surely in a position of power in the heavens at the moment of your birth. . . . Your dark hair . . . your mean stature . . . tragic losses so young in life . . . I think I am right in saying, my dear, that you were born in midwinter?”
“No,” said Harry, “I was born in July.”
As we all know, a part of Voldemort's soul still resides in Harry during this time. And also, Voldemort was born in midwinter.
Was she maybe talking about Voldemort here? Or just one of her other predictions that does not end up being true?