Based on a brief recommendation from Marco Arment, I finally gave Weather Line a try and, I have to say, I'm impressed. Prior to this, Yahoo!'s Weather was my go-to app: I really liked its simple, one-screen display, layered information design, and photographic backgrounds.
Unlike Yahoo!'s app, Weather Line has three primary screens: Hourly, Daily and Monthly. The display is ultra minimal, and relies as much on effective information design as numeric data. The result is not dissimilar to a speedometer, where the way the information is displayed provides an instant read, whether you see the actual numbers or not. It's almost visceral.
Weather Line loads quickly, and toggling between views is immediate. The app makes no attempt to "go deep," focusing instead of what matters most (to me, at least): what's the weather like now, and in the next few hours and days?
Yes, I know Weather Line has been around for a while, and I'm late to the game. Nonetheless, it's a great example of the things I strive for in my own work: simplicity, utility, and (hopefully) beauty.