If you are inclined to take further what you have learned in this and previous chapters, you may wish to expand and improve the app in the following ways:
Add the same functionality to the iPhone app, but present much more of the wealth of information provided by http://openweathermap.org/.
The UI is a very Spartan one, you should be able to find any number of tweaks that will make your version of the app look a thousand bucks more expensive.