If you happen to live in a very cold area within the United States, don’t bother using the weather application on your iPhone. The weather application does not display negative Fahrenheit temperatures and just replaces them with 0F. If you’re using Celsius, the application for some reason displays negative temperatures. This was pointed out by a person in Alaska who posted on the Apple discussion boards.
I live in Alaska. The temps here have all been below zero F or more than -18C but the weather reported on the iPhone never goes below zero F. right now it is -13F and going to Yahoo says this but the iPhone shows 0F.
Currently in Nome, Alaska it’s a chilling -18F, yet the iPhone displays 0F. Hopefully Apple fixes this bug in the next update as it’s getting pretty darn cold here.