It's 25 degree Celsius NOW. This is totally a new idea until now.
Icon images on iPhone screen are fixed, they never change - think about it, Weather app icon, the number below sun image stuck on 73F or 23C, Clock, always 10:15, Map always locating on Apple HQ. The only app allowed to change is Calendar, this is a special app. But think about it, you always see something on the top-right of some icons, it's a number, but it is called a Badge. iPhone use these badges to display unread message counts or items on your to-do list. But very use these to covey other information.
This app "Celsius" and "Fahrenheit" use these Badges, pop-up numbers, to introduce the current temperature.
You can add cities of your choice into the list and select the city you want to display in Badges at 'Locations' menu.
To see today's 3-hourly forecast, tap Today. In the same screen, you also can check how thick the cloud is and share the whether information via Twitter or Facebook.
Once revealed this doesn't look new at all but this must be one of the breakthrough ideas on iOS apps developing. This is the app for some reason you must want to put on your home screen.
