I have had a couple of weather apps. So far the weather channels is the most accurate for where I'm at. I know that doesn't answer your question but I think I've had that one and deleted it. I'll download it to see what happens so I can actually answer your question.
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I would install free Weather Eye, they just added a lot of american cities and it puts an icon on the desktop that shows the weather condition and if you hover over the icon, it will show you the temperature. it updates the weather every 30 minutes too, and gives short and long term forecasts.