See also here, not so easy to find:
[SOLVED] What is the status on the Weather binding?
Did yahoo end support for the yahooweather binding?
[SOLVED] Yahoo weather does not work anymore
Yahoo Weather has stopped working
Weather Binding requires oauth since 2019-01-03 - fix required
Announcing OpenWeatherMap binding for Eclipse SmartHome / openHAB - #189 by JoeSey