Macworld has a really great review of this weather program called WX.
Application developers know a basic truth: people are obsessed with the weather. The slew of weather widgets and apps for both the Mac and iPhone are testament to this fact. Wx is another entrant into the crowded meteorological app field. It brings with it much power and a slightly odd user interface.
Wx can help you decide if you should bring an umbrella to work with you, or it can tell you the current temperature readily either in the dock, in the main window of the app, or in a floating mini display. But Wx is for anyone who's serious about the weather. You can track up to 20 locations by entering a zip code, city/state combination, Latitude/Longitude, or by clicking on a point on a Google map (neat way to get a specific location without knowing the Latitude/Longitude).
At Wx: Powerful weather-tracking program Review | Utilities
Happy holidays from Weather Snob!