Privacy Friendly Weather lets you watch the weather for cities and locations you are interested in. The app has been developed by the research group SECUSO at Karlsruhe Institute of Technology. More info can be found on https://secuso.org/pfa
Does this happen when you opt-out the GhostRank feature? My understanding is that if you decide to support them, then they'll use such data. However, I think I will start using Disconnect. Thanks for your hint!