If you spend most of your day in the browser, then a browser extension that constantly displays the current temperature might make more sense for you.
A very nice choice for Chrome is Weather by 64px. A very simple and easy to understand extension, it auto-detects your location and displays the current temperature.
Click the icon and you get an hourly breakdown of today's weather as well as a four-day forecast. This extension's Weather data comes from Weather Underground.
I'm not a huge fan of the current crop of Firefox extensions, but Aniweather is an interesting choice. It offers a ton of information, but it also takes up a lot of space on the toolbar.
While the weather is not the most exciting topic of conversation, it's always handy to have basic forecast and temperature information at hand, whether it's in a widget, on the taskbar, or sitting in your browser.
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