The app itself is very clearly structured, offers many features (precipitation and cloud radar) and the predictions are accurate. As such, the app deserves 5 stars.
Nevertheless, there's only one star because Amazon offers a completely outdated version here (on the other hand, however, the same price as in the Play Store takes). Update: Wrong!
My tip: This app definitely stay away from Amazon Apps and better access to Google Play. Since there's at least regular updates!