Dark Sky was a rarity in the app world. Universally beloved, the weather app had an uncanny ability to tell you when to expect rain, down to the minute. So when Apple announced plans to buy it six years ago, there was a collective sigh of frustration.

The Android version, of course, disappeared almost immediately, while the iOS version was folded into Apple’s native Weather app. (The stand-alone iPhone app was discontinued.) The integration was never quite the same, though, and it seemed as if the........

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