I live in northern CA where temperatures drop to 40 degrees F at the lowest. I'd say this coat wouldn't be appropriate for temperatures colder than that unless you have some seriously warm layers underneath. This coat also runs on the small side. I'm 5'6 and usually wear size small, the medium was a better fit for me. I might add my own button to attach the inner lining to the outer lining in the back because the inner layer in the back riding up is annoying. Still, super cute coat!