I finally got around to finish up the binding for the Ambient Weather WS-1400IP weather station (see https://www.ambientweather.com/amws1400ip.html). They’re also sold under other brand names. The binding works locally, no need for cloud accounts such as WeatherUnderground etc.
Some documentation and the source code is here: https://github.com/HentschelT/openhab2-addons/tree/master/addons/binding/org.openhab.binding.ambientweather1400ip
For configuration, it needs the IP address or hostname of the little gateway device (IPObserver) that comes with the weather station.
You can download the latest addon jar file at https://github.com/HentschelT/openhab2-addons/tree/master/addons/binding/org.openhab.binding.ambientweather1400ip/releases , just drop the jar file into the addon folder of your OpenHAB installation. Once I got some feedback, I’ll probably add it to the market place for easier installation.