I tried Dark Sky yesterday. Using the same location as the iOS 15.5 Weather app in both apps (Wickenburg Municipal Airport), the iOS Weather app agreed 99% with the Davis Vantage Pro weather station in my yard. The Dark Sky app was wildly different on the 7 day forecast, one day 8º off (vs. Weather, and Weather Underground using a local station). For the current conditions, Dark Sky varied from Weather and my Davis station by 3º, while relative humidity and dew point temperature were also off by too much, vs. the Weather app and my Davis station. Yes, Dark Sky has lots of information, but it is useless if it is wrong,.