This is the software publisher's description.

Weather Watcher is your personal Windows desktop weather station. Automatically retrieve the current conditions, hourly forecast, daily forecast, detailed forecast, severe weather alerts, and weather maps for over 77,000 cities worldwide.

The current conditions can be viewed quickly by holding your mouse pointer over the Weather Watcher system tray icon.

Weather Watcher will allow you to automatically retrieve your weather data at a set interval, display the current temperature in a customised tray icon, display the current condition image in a tray icon, designate which weather information is displayed in the Weather Watcher system tray tool-tip, convert the weather data using almost any conversion, display a weather map as your desktop wallpaper, log the weather data in any format, export the weather data in any format, customise the look of the Weather Watcher interface and icons via skins, and much more.