System Tray Temperature

Why doesn’t the system tray show negative temperature?

The negative sign will only display if the following setting is unchecked:

When unchecked, you'll also need to make sure the system tray text is set to a font and/or font size that is small enough to fit in the visible area that Windows allows for a system tray icon. Since that is a challenge for most font faces, you can also set different tray icon colors to show when the temperature is below freezing/zero. Those colors settings can be found in the following section of the Weather Watcher Options window: