My favorite iPhone app is Celsius, a weather application. I use it almost every day to check the weather forecast for my area.

The thing I like most about this app is that the weather info is localized and quite detailed. It has a 10-day forecast for your locations and it also includes info about cloud cover, rainfall totals, sunrise/sunset times, wind direction and lots more.

It's a paid app and it costs $0.99.

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