Random Riddle: Birth Months

Four sisters, Sara, Ophelia, Nora, and Dawn, were each born in a different one of the months September, October, November, and December.

“This is terrible,” said Ophelia one day. “None of us have an initial that matches the initial of her birth month.”

“I don’t mind at all,” replied the girl who was born in September.

“That’s easy for you to say,” said Nora. “It would at least be cool if the initial of my birth month was a vowel, but no.”

In which month was each girl born?
 

Random Riddle: Birth Months